diff --git a/blog/use-smart-passphrases-stop-enforcing-weak-and-complicated-passwords.mdwn b/blog/use-smart-passphrases-stop-enforcing-weak-and-complicated-passwords.mdwn
index ca0bbbba..91531eb1 100644
--- a/blog/use-smart-passphrases-stop-enforcing-weak-and-complicated-passwords.mdwn
+++ b/blog/use-smart-passphrases-stop-enforcing-weak-and-complicated-passwords.mdwn
@@ -103,4 +103,7 @@ characters,
 it would give you 1901722457268488241418827816020396748021170176
 or 1.90172e+45 possible passwords.
 
+[XKCD](http://xkcd.com/936/) also has a nice cartoon describing
+this solution.
+
 [[!tag net security]]