Index: util/title_testharness
===================================================================
--- util/title_testharness (revision 122)
+++ util/title_testharness (revision 125)
@@ -47,5 +47,10 @@
 	      "\t\ttest the various title-matching algorithms based on\n".
 	      "\t\tstdin from a list of titles {titles_file}.\n".
-	      "\t\talgorithms:\n\t\t  '".join("'\n\t\t  '",sort keys %algorithms)."'\n";
+	      "\n".
+	      "\t$0 --compare algorithm1,alghrithm2\n".
+	      "\t\tcompare two title-matching algorithms against each other,\n".
+	      "\t\tprinting only cases where they differ.\n".
+	      "\n".
+	      "\t\tAlgorithm names:\n\t\t  '".join("'\n\t\t  '",sort keys %algorithms)."'\n";
 	exit(0);
 }