diff --git a/doc/CREDITS b/doc/CREDITS
index b63244415..3e16b3052 100644
--- a/doc/CREDITS
+++ b/doc/CREDITS
@@ -92,7 +92,8 @@ More special thanks to:
 
   * Piotr Fusik <P.Fusik@elka.pw.edu.pl>
 
-    for lots of bug reports, code snippets and suggestions.
+    for the zlib routines, lots of bug reports, code snippets and 
+    suggestions.
 
   * Josef Soucek <josef.soucek@ct.cz>