Comment (add Author:, based on authors.el).

lib-src/hexl.c

 /* Convert files for Emacs Hexl mode.
-   Copyright (C) 1989, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
-                 2008, 2009  Free Software Foundation, Inc.
+   Copyright (C) 1989, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
+                 2009  Free Software Foundation, Inc.
+
+Author: Keith Gabryelski
+(according to authors.el)
 
 This file is not considered part of GNU Emacs.
 

lib-src/vcdiff

 #! /bin/sh
-#
+
 # Enhanced sccs diff utility for use with vc mode.
 # This version is more compatible with rcsdiff(1).
-#
+
 # Copyright (C) 1992, 1993, 1995, 1997, 2001, 2002, 2003, 2004, 2005,
 #   2006, 2007, 2008, 2009  Free Software Foundation, Inc.
 
+# Author: Paul Eggert
+# (according to authors.el)
+
 # This file is part of GNU Emacs.
 
 # GNU Emacs is free software: you can redistribute it and/or modify