diff --git a/content/reference/hoon/stdlib/1a.md b/content/reference/hoon/stdlib/1a.md
index f856748..7884119 100644
--- a/content/reference/hoon/stdlib/1a.md
+++ b/content/reference/hoon/stdlib/1a.md
@@ -728,8 +728,7 @@ An [`atom`](/reference/glossary/atom).
   ~/  %mod
   |:  [a=`@`1 b=`@`1]
   ^-  @
-  ?<  =(0 b)
-  (sub a (mul b (div a b)))
+  +:(dvr a b)
 ```
 
 #### Examples