diff --git a/paren.html.markdown b/paren.html.markdown
index 9fffaf93..cde14853 100644
--- a/paren.html.markdown
+++ b/paren.html.markdown
@@ -8,7 +8,7 @@ contributors:
 
 [Paren](https://bitbucket.org/ktg/paren) is a dialect of Lisp. It is designed to be an embedded language.
 
-Some examples are from http://learnxinyminutes.com/docs/racket/ .
+Some examples are from <http://learnxinyminutes.com/docs/racket/>.
 
 ```scheme
 ;;; Comments