diff --git a/m-rbtree.h b/m-rbtree.h
index 849b7152..9d49e2a5 100644
--- a/m-rbtree.h
+++ b/m-rbtree.h
@@ -52,7 +52,9 @@
                   (__VA_ARGS__ )))
 
 
-/********************************** INTERNAL ************************************/
+/*****************************************************************************/
+/********************************** INTERNAL *********************************/
+/*****************************************************************************/
 
 /* Deferred evaluation for the oplist definition,
    so that all arguments are evaluated before further expansion */