diff --git a/source/basic.tex b/source/basic.tex
index a78628ca87..7707fe369b 100644
--- a/source/basic.tex
+++ b/source/basic.tex
@@ -827,7 +827,7 @@
 
 \item In each such definition,
 corresponding \grammarterm{reflect-expression}s\iref{expr.reflect}
-compute equivalent values\iref{expr.eq}.
+shall compute equivalent values\iref{expr.eq}.
 \end{itemize}
 
 \pnum