diff --git a/01_values/01_01_basic_values.cpp b/01_values/01_01_basic_values.cpp
index 9903b20..01520eb 100644
--- a/01_values/01_01_basic_values.cpp
+++ b/01_values/01_01_basic_values.cpp
@@ -1,4 +1,4 @@
-
+// https://godbolt.org/z/cfqo6YK7K
 #include <iostream>
 
 void f_int(int i) {
diff --git a/01_values/01_02_basic_references.cpp b/01_values/01_02_basic_references.cpp
index d596334..c3ed916 100644
--- a/01_values/01_02_basic_references.cpp
+++ b/01_values/01_02_basic_references.cpp
@@ -1,4 +1,4 @@
-
+// https://godbolt.org/z/sGeWevjcv
 #include <iostream>
 
 // we read "int&" as "integer reference"
diff --git a/01_values/01_03_lifecycle_creation_destruction.cpp b/01_values/01_03_lifecycle_creation_destruction.cpp
index 27a424b..66e3b20 100644
--- a/01_values/01_03_lifecycle_creation_destruction.cpp
+++ b/01_values/01_03_lifecycle_creation_destruction.cpp
@@ -1,4 +1,4 @@
-
+// https://godbolt.org/z/eb5qK3KxE
 #include <iostream>
 
 // a "struct" is just like a class, except for default visibility being "public"
diff --git a/01_values/01_04_lifecycle_copy_construction.cpp b/01_values/01_04_lifecycle_copy_construction.cpp
index 593727a..7a96618 100644
--- a/01_values/01_04_lifecycle_copy_construction.cpp
+++ b/01_values/01_04_lifecycle_copy_construction.cpp
@@ -1,4 +1,4 @@
-
+// https://godbolt.org/z/o4MEPEjY1
 #include <iostream>
 
 struct C {
diff --git a/01_values/01_05_lifecycle_raii.cpp b/01_values/01_05_lifecycle_raii.cpp
index 670101e..ad9e52f 100644
--- a/01_values/01_05_lifecycle_raii.cpp
+++ b/01_values/01_05_lifecycle_raii.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/zGsrxG91Y
 #include <iostream>
 #include <fstream>
 
diff --git a/01_values/01_06_advanced_string.cpp b/01_values/01_06_advanced_string.cpp
index b1f3b64..36ba299 100644
--- a/01_values/01_06_advanced_string.cpp
+++ b/01_values/01_06_advanced_string.cpp
@@ -1,4 +1,4 @@
-
+// https://godbolt.org/z/9bYz4oP3z
 #include <stdlib.h>
 #include <string.h>
 #include <iostream>
diff --git a/01_values/01_07_advanced_string_move.cpp b/01_values/01_07_advanced_string_move.cpp
index fedfa39..acb6ab3 100644
--- a/01_values/01_07_advanced_string_move.cpp
+++ b/01_values/01_07_advanced_string_move.cpp
@@ -1,4 +1,4 @@
-
+// https://godbolt.org/z/qKef3jdWq
 #include <stdlib.h>
 #include <string.h>
 #include <iostream>
diff --git a/02_classes_and_interfaces/02_01_basic_interfaces.cpp b/02_classes_and_interfaces/02_01_basic_interfaces.cpp
index 6e6c5fc..bd6c6fd 100644
--- a/02_classes_and_interfaces/02_01_basic_interfaces.cpp
+++ b/02_classes_and_interfaces/02_01_basic_interfaces.cpp
@@ -1,4 +1,4 @@
-
+// https://godbolt.org/z/TGqsGba5x
 // Some examples are taken (or minimally adapted) from the C++ Core Guidelines
 
 #include <cmath>
diff --git a/02_classes_and_interfaces/02_04_return_smart_pointers.cpp b/02_classes_and_interfaces/02_04_return_smart_pointers.cpp
index 1e6c3c5..90edab2 100644
--- a/02_classes_and_interfaces/02_04_return_smart_pointers.cpp
+++ b/02_classes_and_interfaces/02_04_return_smart_pointers.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/W7T7dKnoe
 #include <iostream>
 #include <memory>
 
diff --git a/02_classes_and_interfaces/02_07_virtual_inheritance.cpp b/02_classes_and_interfaces/02_07_virtual_inheritance.cpp
index fd5ff64..c8be0ef 100644
--- a/02_classes_and_interfaces/02_07_virtual_inheritance.cpp
+++ b/02_classes_and_interfaces/02_07_virtual_inheritance.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/c9EvnWffo
 #include <iostream>
 
 class A {
diff --git a/02_classes_and_interfaces/02_08_private_inheritance.cpp b/02_classes_and_interfaces/02_08_private_inheritance.cpp
index 7cdb4d5..99837c9 100644
--- a/02_classes_and_interfaces/02_08_private_inheritance.cpp
+++ b/02_classes_and_interfaces/02_08_private_inheritance.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/sWzYq9Mnj
 #include <vector>
 #include <iostream>
 
diff --git a/02_classes_and_interfaces/02_09_operator_overloading.cpp b/02_classes_and_interfaces/02_09_operator_overloading.cpp
index 123eee4..43e2980 100644
--- a/02_classes_and_interfaces/02_09_operator_overloading.cpp
+++ b/02_classes_and_interfaces/02_09_operator_overloading.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/ns1xecTfb
 #include <iostream>
 #include <iomanip>
 
diff --git a/02_classes_and_interfaces/02_10_friends.cpp b/02_classes_and_interfaces/02_10_friends.cpp
index 150f388..7198f60 100644
--- a/02_classes_and_interfaces/02_10_friends.cpp
+++ b/02_classes_and_interfaces/02_10_friends.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/KeThK93ox
 #include <string>
 #include <iostream>
 
diff --git a/02_classes_and_interfaces/02_11_hidden_friends.cpp b/02_classes_and_interfaces/02_11_hidden_friends.cpp
index d0d4539..7532496 100644
--- a/02_classes_and_interfaces/02_11_hidden_friends.cpp
+++ b/02_classes_and_interfaces/02_11_hidden_friends.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/YEcffEEzo
 #include <string>
 #include <iostream>
 
diff --git a/03_lambdas_and_algorithms/03_01_containers_sequence.cpp b/03_lambdas_and_algorithms/03_01_containers_sequence.cpp
index ddf8b41..b0e2fa7 100644
--- a/03_lambdas_and_algorithms/03_01_containers_sequence.cpp
+++ b/03_lambdas_and_algorithms/03_01_containers_sequence.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/KhT8er4Wr
 #include <array>
 #include <vector>
 #include <deque>
diff --git a/03_lambdas_and_algorithms/03_02_containers_associative.cpp b/03_lambdas_and_algorithms/03_02_containers_associative.cpp
index cc70d9a..63302e8 100644
--- a/03_lambdas_and_algorithms/03_02_containers_associative.cpp
+++ b/03_lambdas_and_algorithms/03_02_containers_associative.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/q19so8Ya9
 #include <set>
 #include <map>
 
diff --git a/03_lambdas_and_algorithms/03_03_containers_unordered.cpp b/03_lambdas_and_algorithms/03_03_containers_unordered.cpp
index a1c0edc..2a0458d 100644
--- a/03_lambdas_and_algorithms/03_03_containers_unordered.cpp
+++ b/03_lambdas_and_algorithms/03_03_containers_unordered.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/bWY3jMqn8
 #include <unordered_set>
 
 #include <iostream>
diff --git a/03_lambdas_and_algorithms/03_04_iterators.cpp b/03_lambdas_and_algorithms/03_04_iterators.cpp
index 4e9cbe1..ded8d09 100644
--- a/03_lambdas_and_algorithms/03_04_iterators.cpp
+++ b/03_lambdas_and_algorithms/03_04_iterators.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/55rEh1avj
 #include <vector>
 #include <map>
 #include <string>
diff --git a/03_lambdas_and_algorithms/03_05_lambda_basics.cpp b/03_lambdas_and_algorithms/03_05_lambda_basics.cpp
index 98eebf6..4627161 100644
--- a/03_lambdas_and_algorithms/03_05_lambda_basics.cpp
+++ b/03_lambdas_and_algorithms/03_05_lambda_basics.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/h8xMTYjj1
 #include <vector>
 #include <functional>
 #include <iostream>
diff --git a/03_lambdas_and_algorithms/03_07_lambda_implementation.cpp b/03_lambdas_and_algorithms/03_07_lambda_implementation.cpp
index 3fd73fa..83ba427 100644
--- a/03_lambdas_and_algorithms/03_07_lambda_implementation.cpp
+++ b/03_lambdas_and_algorithms/03_07_lambda_implementation.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/eWhKPhPPG
 #include <iostream>
 
 void test1() {
diff --git a/03_lambdas_and_algorithms/03_08_alg_examples.cpp b/03_lambdas_and_algorithms/03_08_alg_examples.cpp
index 5a0d4ff..00afef6 100644
--- a/03_lambdas_and_algorithms/03_08_alg_examples.cpp
+++ b/03_lambdas_and_algorithms/03_08_alg_examples.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/ssKxxnb7q
 #include <iostream>
 #include <vector>
 #include <algorithm>
diff --git a/03_lambdas_and_algorithms/03_09_exec_policy_bench.cpp b/03_lambdas_and_algorithms/03_09_exec_policy_bench.cpp
index 2448eb6..82d532b 100644
--- a/03_lambdas_and_algorithms/03_09_exec_policy_bench.cpp
+++ b/03_lambdas_and_algorithms/03_09_exec_policy_bench.cpp
@@ -1,5 +1,5 @@
 // g++ main.cpp -O3 -std=c++20 -ltbb -Wall -Wextra -o main
-
+// https://godbolt.org/z/xfPWd8orh
 #include <algorithm>
 #include <iomanip>
 #include <numeric>
diff --git a/04_templates/04_01_function_templates_basic.cpp b/04_templates/04_01_function_templates_basic.cpp
index 34bfb4e..63a6b99 100644
--- a/04_templates/04_01_function_templates_basic.cpp
+++ b/04_templates/04_01_function_templates_basic.cpp
@@ -1,4 +1,4 @@
-
+// https://godbolt.org/z/6M7sfK3jT
 #if true
 
 int abs(int x) {
diff --git a/04_templates/04_02_template_parameter_categories.cpp b/04_templates/04_02_template_parameter_categories.cpp
index a7f5f84..0e77456 100644
--- a/04_templates/04_02_template_parameter_categories.cpp
+++ b/04_templates/04_02_template_parameter_categories.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/Wzx9GnzoT
 #include <array>
 #include <iostream>
 #include <string>
diff --git a/04_templates/04_03_template_parameter_packs.cpp b/04_templates/04_03_template_parameter_packs.cpp
index 59a579e..2ffc713 100644
--- a/04_templates/04_03_template_parameter_packs.cpp
+++ b/04_templates/04_03_template_parameter_packs.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/brz64acKa
 #include <unordered_set>
 
 #include <iostream>
diff --git a/04_templates/04_04_template_arguments.cpp b/04_templates/04_04_template_arguments.cpp
index 00fe4da..62c515e 100644
--- a/04_templates/04_04_template_arguments.cpp
+++ b/04_templates/04_04_template_arguments.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/Gxn7Y7Tes
 #include <iostream>
 #include <vector>
 #include <list>
diff --git a/04_templates/04_05_class_template_basics.cpp b/04_templates/04_05_class_template_basics.cpp
index f582033..eb08ea1 100644
--- a/04_templates/04_05_class_template_basics.cpp
+++ b/04_templates/04_05_class_template_basics.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/WE1YqvP7j
 #include <initializer_list>
 #include <algorithm>
 
diff --git a/04_templates/04_06_template_specialization.cpp b/04_templates/04_06_template_specialization.cpp
index ab3f87c..7911605 100644
--- a/04_templates/04_06_template_specialization.cpp
+++ b/04_templates/04_06_template_specialization.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/Yox7Y53We
 #include <initializer_list>
 #include <algorithm>
 
diff --git a/04_templates/04_07_class_template_arg_deduction.cpp b/04_templates/04_07_class_template_arg_deduction.cpp
index f1f8a4d..4dd5d18 100644
--- a/04_templates/04_07_class_template_arg_deduction.cpp
+++ b/04_templates/04_07_class_template_arg_deduction.cpp
@@ -1,5 +1,5 @@
 // you can see this example working with recent GCC and Clang versions here:
-// https://godbolt.org/z/WzFsJp
+// https://godbolt.org/z/xvnxjcnK9
 
 #include <algorithm>
 #include <type_traits>
diff --git a/04_templates/04_08_variable_templates.cpp b/04_templates/04_08_variable_templates.cpp
index c0d3da0..6feccbc 100644
--- a/04_templates/04_08_variable_templates.cpp
+++ b/04_templates/04_08_variable_templates.cpp
@@ -1,4 +1,4 @@
-
+// https://godbolt.org/z/8PKz1bnYr
 // variable template for pi
 
 template<class T>
diff --git a/04_templates/04_09_alias_templates.cpp b/04_templates/04_09_alias_templates.cpp
index fd24655..9d57405 100644
--- a/04_templates/04_09_alias_templates.cpp
+++ b/04_templates/04_09_alias_templates.cpp
@@ -1,3 +1,5 @@
+// https://godbolt.org/z/PKTGr39Gh
+#include <algorithm> 
 #include <initializer_list>
 
 template<typename ScalarType, int Length>
diff --git a/04_templates/04_10_two_phase_lookup.cpp b/04_templates/04_10_two_phase_lookup.cpp
index c3364c2..666117b 100644
--- a/04_templates/04_10_two_phase_lookup.cpp
+++ b/04_templates/04_10_two_phase_lookup.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/PM8edoq9f
 #include <iostream>
 
 /// Non-dependent name
diff --git a/04_templates/04_11_parsing_hints.cpp b/04_templates/04_11_parsing_hints.cpp
index 18f963e..fa1bb80 100644
--- a/04_templates/04_11_parsing_hints.cpp
+++ b/04_templates/04_11_parsing_hints.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/fM678oGcf
 #include <iostream>
 
 /// Dependent name
diff --git a/05_keyword_safari/05_01_storage_classes.cpp b/05_keyword_safari/05_01_storage_classes.cpp
index 1dc6aeb..9ca0993 100644
--- a/05_keyword_safari/05_01_storage_classes.cpp
+++ b/05_keyword_safari/05_01_storage_classes.cpp
@@ -1,4 +1,4 @@
-
+// https://godbolt.org/z/xPhrhdYs9
 
 int global1;
 // global1: static storage duration, external linkage
diff --git a/05_keyword_safari/05_02_static_initialization.cpp b/05_keyword_safari/05_02_static_initialization.cpp
index b038980..25e2a47 100644
--- a/05_keyword_safari/05_02_static_initialization.cpp
+++ b/05_keyword_safari/05_02_static_initialization.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/csjnTxjcT
 #include <iostream>
 
 struct Trace {
diff --git a/05_keyword_safari/05_03_cv_qualification.cpp b/05_keyword_safari/05_03_cv_qualification.cpp
index 7b7b2fa..e275b56 100644
--- a/05_keyword_safari/05_03_cv_qualification.cpp
+++ b/05_keyword_safari/05_03_cv_qualification.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/b3vzz9rdd
 
 void take_int_ref(int& i) {}
 
diff --git a/05_keyword_safari/05_04_static_members.cpp b/05_keyword_safari/05_04_static_members.cpp
index c128a9c..f1f4008 100644
--- a/05_keyword_safari/05_04_static_members.cpp
+++ b/05_keyword_safari/05_04_static_members.cpp
@@ -1,4 +1,4 @@
-
+// https://godbolt.org/z/bsTfzEzan
 #include <iostream>
 
 struct Foo {
diff --git a/05_keyword_safari/05_05_explicit_constructors.cpp b/05_keyword_safari/05_05_explicit_constructors.cpp
index aab11bf..ff487e8 100644
--- a/05_keyword_safari/05_05_explicit_constructors.cpp
+++ b/05_keyword_safari/05_05_explicit_constructors.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/hnhxejcfE
 #include <iostream>
 
 struct Point {
diff --git a/05_keyword_safari/05_06_member_ref_qualifiers.cpp b/05_keyword_safari/05_06_member_ref_qualifiers.cpp
index 633e3ab..fa550a9 100644
--- a/05_keyword_safari/05_06_member_ref_qualifiers.cpp
+++ b/05_keyword_safari/05_06_member_ref_qualifiers.cpp
@@ -1,4 +1,4 @@
-
+// https://godbolt.org/z/v757ca5oW
 class Vector {
 	float contents[10];
 
diff --git a/05_keyword_safari/05_08_constexpr.cpp b/05_keyword_safari/05_08_constexpr.cpp
index 5d95347..b098124 100644
--- a/05_keyword_safari/05_08_constexpr.cpp
+++ b/05_keyword_safari/05_08_constexpr.cpp
@@ -1,4 +1,4 @@
-
+// https://godbolt.org/z/oTaPxP6Ec
 #include <iostream>
 
 constexpr int fac(int n) {
@@ -16,4 +16,3 @@ int main() {
 	constN<fac(4)> out1;
 }
 
-// https://godbolt.org/g/XoaGL9
diff --git a/05_keyword_safari/05_09_constevalinit.cpp b/05_keyword_safari/05_09_constevalinit.cpp
index 93796e2..a2f5dea 100644
--- a/05_keyword_safari/05_09_constevalinit.cpp
+++ b/05_keyword_safari/05_09_constevalinit.cpp
@@ -1,5 +1,5 @@
 // Sample adapted from cppreference
-// Available in compiler explorer: https://godbolt.org/z/7YY3sb9YP
+// https://godbolt.org/z/zKhYaf33q
 
 #include <iostream>
 
diff --git a/06_advanced_templates/06_01_simple_template_metafunction.cpp b/06_advanced_templates/06_01_simple_template_metafunction.cpp
index 01b72e1..8a9e829 100644
--- a/06_advanced_templates/06_01_simple_template_metafunction.cpp
+++ b/06_advanced_templates/06_01_simple_template_metafunction.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/oaWPrb6e5
 #include <iostream>
 #include <climits>
 
diff --git a/06_advanced_templates/06_02_type_parameter.cpp b/06_advanced_templates/06_02_type_parameter.cpp
index a4dd3b8..6edc767 100644
--- a/06_advanced_templates/06_02_type_parameter.cpp
+++ b/06_advanced_templates/06_02_type_parameter.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/rj8avoKoz
 #include <iostream>
 
 template<typename T>
diff --git a/06_advanced_templates/06_03_type_result.cpp b/06_advanced_templates/06_03_type_result.cpp
index c9a7d77..e08ac97 100644
--- a/06_advanced_templates/06_03_type_result.cpp
+++ b/06_advanced_templates/06_03_type_result.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/PdP48h9ET
 #include <type_traits>
 #include <iostream>
 
diff --git a/06_advanced_templates/06_04_refactoring_conventions.cpp b/06_advanced_templates/06_04_refactoring_conventions.cpp
index d740e43..6d198b1 100644
--- a/06_advanced_templates/06_04_refactoring_conventions.cpp
+++ b/06_advanced_templates/06_04_refactoring_conventions.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/85b9Esxvn
 #include <type_traits>
 #include <iostream>
 
diff --git a/06_advanced_templates/06_05_tuple_includes.cpp b/06_advanced_templates/06_05_tuple_includes.cpp
index 7a7089c..46826c2 100644
--- a/06_advanced_templates/06_05_tuple_includes.cpp
+++ b/06_advanced_templates/06_05_tuple_includes.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/nhao6438h
 #include <iostream>
 #include <tuple>
 
diff --git a/06_advanced_templates/06_06_tuple_includes_prime.cpp b/06_advanced_templates/06_06_tuple_includes_prime.cpp
index c8cc306..1423565 100644
--- a/06_advanced_templates/06_06_tuple_includes_prime.cpp
+++ b/06_advanced_templates/06_06_tuple_includes_prime.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/fnEPqs6jq
 #include <iostream>
 #include <tuple>
 
diff --git a/06_advanced_templates/06_07_dispatch.cpp b/06_advanced_templates/06_07_dispatch.cpp
index 5bfbf1b..161bbf8 100644
--- a/06_advanced_templates/06_07_dispatch.cpp
+++ b/06_advanced_templates/06_07_dispatch.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/sdW5894xe
 #include <iostream>
 
 /// Scenario: /////////////////////////////////////////////////////////////////
diff --git a/06_advanced_templates/06_08_decltype_declval.cpp b/06_advanced_templates/06_08_decltype_declval.cpp
index 8e959cb..3b27fb2 100644
--- a/06_advanced_templates/06_08_decltype_declval.cpp
+++ b/06_advanced_templates/06_08_decltype_declval.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/5cY9v39Y9
 #include <iostream>
 #include <string>
 
diff --git a/06_advanced_templates/06_09_sfinae.cpp b/06_advanced_templates/06_09_sfinae.cpp
index 6e04e4b..9c1f15e 100644
--- a/06_advanced_templates/06_09_sfinae.cpp
+++ b/06_advanced_templates/06_09_sfinae.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/jr9cr9GPP
 #include <iostream>
 #include <string>
 
diff --git a/06_advanced_templates/06_10_crtp.cpp b/06_advanced_templates/06_10_crtp.cpp
index 62f00d0..369ab40 100644
--- a/06_advanced_templates/06_10_crtp.cpp
+++ b/06_advanced_templates/06_10_crtp.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/qEsshf7Yn
 #include <iostream>
 
 template <class T>
diff --git a/07_concepts/07_01_basic_sample.cpp b/07_concepts/07_01_basic_sample.cpp
index 2b15551..4bb6ce2 100644
--- a/07_concepts/07_01_basic_sample.cpp
+++ b/07_concepts/07_01_basic_sample.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/To89f71M4
 #include <concepts>
 #include <cstddef>
 #include <functional>
diff --git a/07_concepts/07_02_syntax_options.cpp b/07_concepts/07_02_syntax_options.cpp
index 0829a58..6c2ce5e 100644
--- a/07_concepts/07_02_syntax_options.cpp
+++ b/07_concepts/07_02_syntax_options.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/GsE1rvqnT
 #include <concepts>
 #include <cstddef>
 #include <functional>
diff --git a/07_concepts/07_03_constrained_auto.cpp b/07_concepts/07_03_constrained_auto.cpp
index 6958f64..1a67150 100644
--- a/07_concepts/07_03_constrained_auto.cpp
+++ b/07_concepts/07_03_constrained_auto.cpp
@@ -1,4 +1,4 @@
-// note: this is currently not supported in MSVC 16.8
+// https://godbolt.org/z/WPGscxPdo
 
 #include <concepts>
 #include <cstddef>
diff --git a/07_concepts/07_04_requires_expression.cpp b/07_concepts/07_04_requires_expression.cpp
index ffbfa98..3638d06 100644
--- a/07_concepts/07_04_requires_expression.cpp
+++ b/07_concepts/07_04_requires_expression.cpp
@@ -1,4 +1,4 @@
-
+// https://godbolt.org/z/WYEoW5bzz
 // basic requires expression in a concept definition
 template <typename T>
 concept Addable = requires(T x) {
diff --git a/07_concepts/07_05_requirements.cpp b/07_concepts/07_05_requirements.cpp
index 3ec046e..9f590aa 100644
--- a/07_concepts/07_05_requirements.cpp
+++ b/07_concepts/07_05_requirements.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/75q59E7cv
 #include <utility>
 #include <concepts>
 
diff --git a/07_concepts/07_06_dispatch.cpp b/07_concepts/07_06_dispatch.cpp
index aa16eba..7bf2615 100644
--- a/07_concepts/07_06_dispatch.cpp
+++ b/07_concepts/07_06_dispatch.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/xdEssa3bP
 #include <iostream>
 
 /// Scenario: /////////////////////////////////////////////////////////////////
diff --git a/07_concepts/07_07_partial_order.cpp b/07_concepts/07_07_partial_order.cpp
index 3b2b2db..5d393a2 100644
--- a/07_concepts/07_07_partial_order.cpp
+++ b/07_concepts/07_07_partial_order.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/6c5r537e5
 #include <iostream>
 
 template<typename T>
@@ -52,4 +53,4 @@ void test3() {
 int main() {
 	test1();
 	test2();
-}
\ No newline at end of file
+}
diff --git a/08_libraries/08_01_regex.cpp b/08_libraries/08_01_regex.cpp
index e9b899f..99f8db5 100644
--- a/08_libraries/08_01_regex.cpp
+++ b/08_libraries/08_01_regex.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/5TGhEzhn8
 #include <iostream>
 #include <string>
 #include <regex>
diff --git a/08_libraries/08_02_threads.cpp b/08_libraries/08_02_threads.cpp
index 9d8c651..7d28c93 100644
--- a/08_libraries/08_02_threads.cpp
+++ b/08_libraries/08_02_threads.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/81cd58Wxr
 #include <iostream>
 #include <string>
 #include <thread>
diff --git a/08_libraries/08_03_future_fs.cpp b/08_libraries/08_03_future_fs.cpp
index 9026c65..416450e 100644
--- a/08_libraries/08_03_future_fs.cpp
+++ b/08_libraries/08_03_future_fs.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/5T7E4W45r
 #include <iostream>
 #include <string>
 #include <future>
diff --git a/08_libraries/08_04_boost_format.cpp b/08_libraries/08_04_boost_format.cpp
index b6a5099..9ee6c8c 100644
--- a/08_libraries/08_04_boost_format.cpp
+++ b/08_libraries/08_04_boost_format.cpp
@@ -1,5 +1,5 @@
 // adapted from boost::format example
-
+// https://godbolt.org/z/3q169Eoa7
 #include <iostream>
 #include <iomanip>
 #include <cassert>
diff --git a/08_libraries/08_05_boost_bimap.cpp b/08_libraries/08_05_boost_bimap.cpp
index 2bc5c7e..f7e70ab 100644
--- a/08_libraries/08_05_boost_bimap.cpp
+++ b/08_libraries/08_05_boost_bimap.cpp
@@ -1,5 +1,5 @@
 // adapted from boost::bimap example
-
+// https://godbolt.org/z/7Mor8P46z
 #include <string>
 #include <iostream>
 
diff --git a/08_libraries/08_06_boost_operators.cpp b/08_libraries/08_06_boost_operators.cpp
index caf1c43..4f93fd9 100644
--- a/08_libraries/08_06_boost_operators.cpp
+++ b/08_libraries/08_06_boost_operators.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/WGqhjGWd4
 #include <string>
 #include <iostream>
 #include <cmath>
diff --git a/08_libraries/08_07_boost_hana.cpp b/08_libraries/08_07_boost_hana.cpp
index 4b62d7e..7005c6f 100644
--- a/08_libraries/08_07_boost_hana.cpp
+++ b/08_libraries/08_07_boost_hana.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/erGf1bbx9
 #include <iostream>
 
 /// Scenario: /////////////////////////////////////////////////////////////////
diff --git a/08_libraries/08_10_eigen.cpp b/08_libraries/08_10_eigen.cpp
index f0ffe8c..31d5bb1 100644
--- a/08_libraries/08_10_eigen.cpp
+++ b/08_libraries/08_10_eigen.cpp
@@ -1,3 +1,4 @@
+// https://godbolt.org/z/erGf1bbx9
 #include <iostream>
 
 #include <Eigen/Dense>