diff --git a/doc/lispref/modes.texi b/doc/lispref/modes.texi
index b52871ef70b..62d28da2004 100644
--- a/doc/lispref/modes.texi
+++ b/doc/lispref/modes.texi
@@ -2673,6 +2673,7 @@ Setting this variable makes it buffer-local in the current buffer.
 @node Font Lock Mode
 @section Font Lock Mode
 @cindex Font Lock mode
+@cindex syntax highlighting and coloring
 
   @dfn{Font Lock mode} is a buffer-local minor mode that automatically
 attaches @code{face} properties to certain parts of the buffer based on