diff --git a/common-lisp.html.markdown b/common-lisp.html.markdown
index 08134e35..c4ecb5e8 100644
--- a/common-lisp.html.markdown
+++ b/common-lisp.html.markdown
@@ -431,7 +431,7 @@ nil                  ; for false - and the empty list
       :walked
       (walker (1- n))))
 
-(walker) ; => :walked
+(walker 5) ; => :walked
 
 ;; Most of the time, we use DOLIST or LOOP