diff --git a/C_secure_coding/readme.md b/C_secure_coding/readme.md
index db8ffd6..e4256fd 100644
--- a/C_secure_coding/readme.md
+++ b/C_secure_coding/readme.md
@@ -24,3 +24,5 @@ insights.sei.cmu.edu/documents/813/2009_005_001_15110.pdf
 pubs.opengroup.org/onlinepubs/9299969899/toc.pdf
 accu.org
 Magazyn "Programista" - Fujitsu prenumeruje 
+
+https://en.wikibooks.org/wiki/More_C%2B%2B_Idioms