diff --git a/README.md b/README.md
index 9061cef..6613cd6 100644
--- a/README.md
+++ b/README.md
@@ -27,4 +27,6 @@ detect unused #include files
 http://stackoverflow.com/questions/74326/how-should-i-detect-unnecessary-include-files-in-a-large-c-project
 http://stackoverflow.com/questions/614794/c-c-detecting-superfluous-includes
 
+private destructor
+http://stackoverflow.com/questions/631783/what-is-the-use-of-having-destructor-as-private
 ~~~