diff --git a/doc/misc/auth.texi b/doc/misc/auth.texi
index 8a82dc0d7c4..e4eaedbbc75 100644
--- a/doc/misc/auth.texi
+++ b/doc/misc/auth.texi
@@ -31,7 +31,7 @@ license to the document, as described in section 6 of the license.
 
 @dircategory Emacs
 @direntry
-* auth-source: (auth).   The Emacs auth-source library.
+* Auth-source: (auth).   The Emacs auth-source library.
 @end direntry
 
 @titlepage