diff -r 58ab885469f5 -r a7ba12e0d3b7 lib/Tools/env
--- a/lib/Tools/env	Tue Oct 21 20:17:40 2008 +0200
+++ b/lib/Tools/env	Tue Oct 21 20:18:07 2008 +0200
@@ -13,7 +13,7 @@
 function usage()
 {
   echo
-  echo "Usage: $PRG [CMDLINE ...]"
+  echo "Usage: isabelle $PRG [CMDLINE ...]"
   echo
   echo
   echo "  Run CMDLINE within the Isabelle environment (via the system's env command)."