diff -r 498f272b4bcb -r 8df0a190df1e src/HOL/Mirabelle/lib/Tools/mirabelle
--- a/src/HOL/Mirabelle/lib/Tools/mirabelle	Mon Dec 06 10:52:46 2010 +0100
+++ b/src/HOL/Mirabelle/lib/Tools/mirabelle	Mon Dec 06 10:52:48 2010 +0100
@@ -22,7 +22,7 @@
   echo "Usage: isabelle $PRG [OPTIONS] ACTIONS FILES"
   echo
   echo "  Options are:"
-  echo "    -L LOGIC     parent logic to use (default $ISABELLE_LOGIC)"
+  echo "    -L LOGIC     parent logic to use (default $MIRABELLE_LOGIC)"
   echo "    -T THEORY    parent theory to use (default $MIRABELLE_THEORY)"
   echo "    -O DIR       output directory for test data (default $out)"
   echo "    -t TIMEOUT   timeout for each action in seconds (default $timeout)"