1 files changed, 1 insertions, 1 deletions
diff --git a/parse.y b/parse.y
index 8d8ad5e3e2..2ee33381d5 100644
--- a/parse.y
+++ b/parse.y
@@ -3269,7 +3269,7 @@ here_document(here)
 static void
 arg_ambiguous()
 {
-    rb_warning("ambiguous first argument; make sure");
+    rb_warning("ambiguous first argument; put parentheses or even spaces");
 }
 
 #define IS_ARG() (lex_state == EXPR_ARG || lex_state == EXPR_CMDARG)