wording

doc/CREDITS

-$Id: CREDITS,v 1.3 2003-07-26 04:25:53 geuzaine Exp $
+$Id: CREDITS,v 1.4 2003-07-26 18:18:47 geuzaine Exp $
 
 Gmsh is copyright (c) 1997-2003 Christophe Geuzaine
 <geuzaine@acm.caltech.edu> and Jean-Francois Remacle
 <remacle@gce.ucl.ac.be>.
 
-The AVL tree code and YUV image code (DataStr/avl.* and
-Graphics/gl2yuv.*) are copyright (c) 1988-1993, 1995 The Regents of
+The AVL tree code (DataStr/avl.*) and the YUV image code
+(Graphics/gl2yuv.*) are copyright (c) 1988-1993, 1995 The Regents of
 the University of California. Permission to use, copy, modify, and
 distribute this software and its documentation for any purpose and
 without fee is hereby granted, provided that the above copyright
@@ -31,8 +31,8 @@ The colorbar widget (Fltk/Colorbar_Window.cpp) is based on code
 copyright (c) 1990-1995, Bill Hibbard, Brian Paul, Dave Santek, and
 Andre Battaiola.
 
-The GIF routines (Graphics/gl2gif.cpp) are based on code copyright (c)
-1989, 1991, Jef Poskanzer.
+The GIF and PPM routines (Graphics/gl2gif.cpp) are based on code
+copyright (c) 1989, 1991, Jef Poskanzer.
 
 This version of Gmsh may also contain code (in the Triangle
 subdirectory) copyright (c) 1993, 1995, 1997, 1998, 2002, Jonathan