Index: doc/m4.texi
--- doc/m4.texi.orig
+++ doc/m4.texi
@@ -58,7 +58,7 @@ entitled ``GNU Free Documentation License.''
 
 @dircategory Text creation and manipulation
 @direntry
-* M4: (m4).                     A powerful macro processor.
+* GM4: (m4).                     A powerful macro processor.
 @end direntry
 
 @titlepage
