diff --git a/challs/context_free_grammar/README.md b/challs/context_free_grammar/README.md
new file mode 100644
index 00000000..19565a7e
--- /dev/null
+++ b/challs/context_free_grammar/README.md
@@ -0,0 +1,6 @@
+Intended solution
+
+1. Read folder structure as productions.
+2. Folders are nonterminals, files are terminals.
+3. Simplify and reduce.
+4. Some parts are quickly guessable, others can be permuted from given letters and word lengths.
\ No newline at end of file
diff --git a/challs/context_free_grammar/chall/cfg.zip b/challs/context_free_grammar/chall/cfg.zip
new file mode 100644
index 00000000..6786afe6
Binary files /dev/null and b/challs/context_free_grammar/chall/cfg.zip differ
diff --git a/challs/context_free_grammar/solve.py b/challs/context_free_grammar/solve.py
index 70591159..ee0e218d 100644
--- a/challs/context_free_grammar/solve.py
+++ b/challs/context_free_grammar/solve.py
@@ -339,8 +339,8 @@ def get_rules(path, outf):
             line = dir + " -> " + "|".join([x.replace(".txt", "") for x in os.listdir(os.path.join(path, dir))]) + "\n"
             f.write(line)
 
-file = "chall/cfg.txt"
-grammar = Grammar(file)
+#file = "chall/cfg.txt"
+#grammar = Grammar(file)
 #grammar.reduce_mappings()
 #grammar.add_useless_productions()
 #grammar.scramble_nonterminals()