diff --git a/docs/cookbooks/5.6.x/core.md b/docs/cookbooks/5.6.x/core.md
index 9314b9df..38df568e 100644
--- a/docs/cookbooks/5.6.x/core.md
+++ b/docs/cookbooks/5.6.x/core.md
@@ -523,7 +523,7 @@ loadmodule "db_mysql.so"
 #!ifdef
 ```
 
-### trydefenvns
+### trydefenvs
 
 Similar to **#!trydefenv**, but the value is defined in between double
 quotes to make it convenient to be used as a string token.
diff --git a/docs/cookbooks/5.7.x/core.md b/docs/cookbooks/5.7.x/core.md
index aaa79310..fc46cc14 100644
--- a/docs/cookbooks/5.7.x/core.md
+++ b/docs/cookbooks/5.7.x/core.md
@@ -662,7 +662,7 @@ loadmodule "db_mysql.so"
 #!ifdef
 ```
 
-### trydefenvns
+### trydefenvs
 
 Similar to **#!trydefenv**, but the value is defined in between double
 quotes to make it convenient to be used as a string token.
diff --git a/docs/cookbooks/5.8.x/core.md b/docs/cookbooks/5.8.x/core.md
index fa01fb76..6f4ebf35 100644
--- a/docs/cookbooks/5.8.x/core.md
+++ b/docs/cookbooks/5.8.x/core.md
@@ -662,7 +662,7 @@ loadmodule "db_mysql.so"
 #!ifdef
 ```
 
-### trydefenvns
+### trydefenvs
 
 Similar to **#!trydefenv**, but the value is defined in between double
 quotes to make it convenient to be used as a string token.
diff --git a/docs/cookbooks/devel/core.md b/docs/cookbooks/devel/core.md
index 2a907815..626839ec 100644
--- a/docs/cookbooks/devel/core.md
+++ b/docs/cookbooks/devel/core.md
@@ -661,7 +661,7 @@ loadmodule "db_mysql.so"
 #!ifdef
 ```
 
-### trydefenvns
+### trydefenvs
 
 Similar to **#!trydefenv**, but the value is defined in between double
 quotes to make it convenient to be used as a string token.