diff --git a/pkgs/racket-doc/scribblings/guide/performance.scrbl b/pkgs/racket-doc/scribblings/guide/performance.scrbl
index c91ab9feaa..45c8c42954 100644
--- a/pkgs/racket-doc/scribblings/guide/performance.scrbl
+++ b/pkgs/racket-doc/scribblings/guide/performance.scrbl
@@ -618,7 +618,7 @@ full collection with @racket[(collect-garbage)] just before an initial
 @racket[(collect-garbage 'incremental)] to initiate incremental mode
 from an optimal state.
 
-To check whether incremental mode is use and how it affects pause
+To check whether incremental mode is in use and how it affects pause
 times, enable @tt{debug}-level logging output for the
 @racketidfont{GC} topic. For example,