diff --git a/collects/scribblings/reference/sequences.scrbl b/collects/scribblings/reference/sequences.scrbl
index 621dc29ae8..84ee0c679e 100644
--- a/collects/scribblings/reference/sequences.scrbl
+++ b/collects/scribblings/reference/sequences.scrbl
@@ -496,7 +496,7 @@ in the sequence.
   so that @racket[stream-first] produces the same result each time
   is applied to a stream.
 
-  In extracting an element from @racket[seq] involves a side-effect,
+  If extracting an element from @racket[seq] involves a side-effect,
   then the effect is performed each time that either
   @racket[stream-first] or @racket[stream-rest] is first used to
   access or skip an element.}