diff --git a/rtl.css b/rtl.css
index 1055f9cca..45740f2d5 100644
--- a/rtl.css
+++ b/rtl.css
@@ -4,7 +4,7 @@ Description: Adds support for languages written in a Right To Left (RTL) directi
 It's easy, just a matter of overwriting all the horizontal positioning attributes
 of your CSS stylesheet in a separate stylesheet file named rtl.css.
 
-See http://codex.wordpress.org/Right_to_Left_Language_Support
+See https://codex.wordpress.org/Right_to_Left_Language_Support
 */