diff --git a/source/utilities.tex b/source/utilities.tex
index 0c500de28d..b5f49da246 100644
--- a/source/utilities.tex
+++ b/source/utilities.tex
@@ -4831,7 +4831,7 @@
 
 \pnum
 An object of type \tcode{optional<T\&>}
-\defnx{contains a value}{contains a value!\idxcode{optional.ref}}
+\defnx{contains a value}{contain a value!\idxcode{optional.ref}}
 if and only if \tcode{\exposidnc{val} != nullptr} is \tcode{true}.
 When an \tcode{optional<T\&>} contains a value,
 the \defnx{contained value}{contained value!\idxcode{optional.ref}}