diff --git a/source/preprocessor.tex b/source/preprocessor.tex
index 39cd5e50f2..6407fa43c9 100644
--- a/source/preprocessor.tex
+++ b/source/preprocessor.tex
@@ -1218,7 +1218,7 @@
 \rSec3[cpp.embed.param.if.empty]{\tcode{if_empty} parameter}
 
 \pnum
-An embed-parameter of the form
+An \grammarterm{embed-parameter} of the form
 \begin{ncsimplebnf}
 \terminal{if_empty (} \opt{pp-balanced-token-seq} \terminal{)}
 \end{ncsimplebnf}