1 files changed, 1 insertions, 1 deletions
diff --git a/re.c b/re.c
index f435369fb4..3316da2d72 100644
--- a/re.c
+++ b/re.c
@@ -2867,7 +2867,7 @@ rb_reg_initialize_m(int argc, VALUE *argv, VALUE self)
     long len;
 
     if (argc == 0 || argc > 3) {
-	rb_raise(rb_eArgError, "wrong number of arguments");
+	rb_raise(rb_eArgError, "wrong number of arguments (%d for 1..3)", argc);
     }
     if (TYPE(argv[0]) == T_REGEXP) {
 	VALUE re = argv[0];