fix 'Usage:'

git-svn-id: svn://svn.valgrind.org/vex/trunk@1210

diff --git a/VEX/switchback/binary_switchback.pl b/VEX/switchback/binary_switchback.pl
index 1180e200952c91da2dd297449ee053a1df68f4c5..c994ae5f100326d1204352655d01318804eeeed6 100755 (executable)
--- a/VEX/switchback/binary_switchback.pl
+++ b/VEX/switchback/binary_switchback.pl
@@ -37,7 +37,7 @@ sub Exit {
 }
 
 sub Usage {
-    print "Usage: binary_switchback.pl test_name <start> <last_good> <last_bad>\n";
+    print "Usage: binary_switchback.pl test_name [last_good [last_bad]]\n";
     print "where:\n";
     print "   test_name = obj filename - without '.o'\n";
     print "   last_good = last known good bb (search space minimum)\n";