diff --git a/scripts/runqemu-internal b/scripts/runqemu-internal
index 8165e13e5a..f9d8728224 100755
--- a/scripts/runqemu-internal
+++ b/scripts/runqemu-internal
@@ -214,6 +214,7 @@ else
             fi 
         else
             echo "Using preconfigured tap device '$TAP'"
+            echo "If this is not intended, use flock on $LOCKFILE.lock to make runqemu skip $TAP."
         fi
 
         cleanup() {