diff --git a/_includes/head/custom.html b/_includes/head/custom.html
index 01767313..978d84fd 100644
--- a/_includes/head/custom.html
+++ b/_includes/head/custom.html
@@ -1,5 +1,5 @@
 <!-- start custom head snippets -->
 
-<!-- insert favicons. use http://realfavicongenerator.net/ -->
+<!-- insert favicons. use https://realfavicongenerator.net/ -->
 
-<!-- end custom head snippets -->
\ No newline at end of file
+<!-- end custom head snippets -->