diff --git a/ruby.html.markdown b/ruby.html.markdown
index 8f23b2e6..ec7b2f5e 100644
--- a/ruby.html.markdown
+++ b/ruby.html.markdown
@@ -39,6 +39,7 @@ You shouldn't either
 10 * 2 #=> 20
 35 / 5 #=> 7
 2**5 #=> 32
+5 % 3 #=> 2
 
 # Arithmetic is just syntactic sugar
 # for calling a method on an object