diff --git a/collects/scribblings/reference/mpairs.scrbl b/collects/scribblings/reference/mpairs.scrbl
index e3200b65d8..4d6cc6a0fa 100644
--- a/collects/scribblings/reference/mpairs.scrbl
+++ b/collects/scribblings/reference/mpairs.scrbl
@@ -11,7 +11,7 @@ operations to change the parts of the pair (like traditional Lisp and
 Scheme pairs).
 
 A @deftech{mutable list} is analogous to a list created with pairs, but
-instead created with immutable pairs.
+instead created with mutable pairs.
 
 @; ----------------------------------------
 @section{Mutable Pair Constructors and Selectors}