diff --git a/ruby.html.markdown b/ruby.html.markdown
index 531971e9..a277667b 100644
--- a/ruby.html.markdown
+++ b/ruby.html.markdown
@@ -195,6 +195,7 @@ end
 counter = 1
 while counter <= 5 do
   puts "iteration #{counter}"
+  counter += 1
 end
 #=> iteration 1
 #=> iteration 2