Index: NmapOps.cc
===================================================================
--- NmapOps.cc	(revision 24749)
+++ NmapOps.cc	(working copy)
@@ -479,8 +479,10 @@
   }
 
   /* Prevent performance values from getting out of whack */
-  if (min_parallelism > max_parallelism)
+  if (min_parallelism > max_parallelism) {
+    error("WARNING: --min-parallelism set without --max-parallelism. Maximum parallelism will be set to %i.",min_parallelism);
     max_parallelism = min_parallelism;
+  }
 
   if(ipoptions && osscan)
     error("WARNING: Ip options are NOT used while OS scanning!");