diff -r 58ab885469f5 -r a7ba12e0d3b7 lib/Tools/doc
--- a/lib/Tools/doc	Tue Oct 21 20:17:40 2008 +0200
+++ b/lib/Tools/doc	Tue Oct 21 20:18:07 2008 +0200
@@ -11,7 +11,7 @@
 function usage()
 {
   echo
-  echo "Usage: $PRG [DOC]"
+  echo "Usage: isabelle $PRG [DOC]"
   echo
   echo "  View Isabelle documentation DOC, or show list of available documents."
   echo