diff --git a/collects/scribblings/reference/memory.scrbl b/collects/scribblings/reference/memory.scrbl
index bf7236144e..c6cc0d8333 100644
--- a/collects/scribblings/reference/memory.scrbl
+++ b/collects/scribblings/reference/memory.scrbl
@@ -53,7 +53,7 @@ necessarily count toward the key's reachability. A @tech{weak box} can
 be seen as a specialization of an ephemeron where the key and value
 are the same.
 
-On particularly common use of ephemerons is to combine them with a
+One particularly common use of ephemerons is to combine them with a
 weak hash table (see @secref["hashtables"]) to produce a mapping where
 the memory manager can reclaim key--value pairs even when the value
 refers to the key.