diff --git a/source/ub.tex b/source/ub.tex
index ea49eae87b..727ad0dae8 100644
--- a/source/ub.tex
+++ b/source/ub.tex
@@ -1433,7 +1433,7 @@
 If an attempt is made to access an object
 defined with a volatile-qualified type
 through the use of a non-volatile glvalue,
-the behavior is undefined
+the behavior is undefined.
 
 \pnum
 \begin{example}