diff --git a/docs/language/functions/map.md b/docs/language/functions/map.md
index 55c602c323..726e7cb9e8 100644
--- a/docs/language/functions/map.md
+++ b/docs/language/functions/map.md
@@ -34,7 +34,10 @@ yield map(this, floatToTime)
 ```
 
 ```mdtest-command
-echo '[1697151533.41415,1697151540.716529]' | zq -z -I udf.zed -
+echo '[1697151533.41415,1697151540.716529]' | zq -z '
+  func floatToTime(x): ( cast(x*1000000000, <time>) )
+  yield map(this, floatToTime)
+' -
 ```
 =>
 ```mdtest-output