diff --git a/README.md b/README.md
index bb09231..7f6e31c 100644
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@@ -16,3 +16,7 @@ http://codex.wordpress.org/Function_Reference/comment_form
 The website still gets trackback spam. That's harder to figure out a
 solution, because a trackback is sort of meant to be done by computers.
 Really the only solution for trackback spam is to turn off trackbacks. 
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+More information about the concepts at work here: http://www.smartfile.com/blog/captchas-dont-work-how-to-trick-spam-bots-with-a-smarter-honey-pot/