diff --git a/re.c b/re.c
index 7421519b70..e4c98ebb72 100644
--- a/re.c
+++ b/re.c
@@ -3333,8 +3333,8 @@ rb_reg_match_m(int argc, VALUE *argv, VALUE re)
 
 /*
  *  call-seq:
- *     rxp.match?(str)       -> true or false
- *     rxp.match?(str,pos)   -> true or false
+ *     rxp.match?(str)          -> true or false
+ *     rxp.match?(str, pos=0)   -> true or false
  *
  *  Returns <code>true</code> or <code>false</code> to indicate whether the
  *  regexp is matched or not without updating $~ and other related variables.