diff --git a/source/preprocessor.tex b/source/preprocessor.tex
index 6407fa43c9..ae6414c88a 100644
--- a/source/preprocessor.tex
+++ b/source/preprocessor.tex
@@ -443,7 +443,7 @@
 Otherwise, \mname{STDC_EMBED_NOT_FOUND}.
 \end{itemize}
 \begin{note}
-An unrecognized \grammarterm{embed-parameter} in an \grammarterm{has-embed-expression}
+An unrecognized \grammarterm{embed-parameter} in a \grammarterm{has-embed-expression}
 is not ill-formed and is instead treated as not supported.
 \end{note}