diff --git a/ChangeLog b/ChangeLog
index f1235e4f9a..19c5c82cb3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Fri May 15 18:28:20 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* array.c (rb_ary_assoc, rb_ary_rassoc): [DOC] the result when key
+	  was found is the existing element, not a new array.  reported by
+	  Giau Nguyen <giaunv AT nustechnology.com>.
+
 Fri May 15 08:24:28 2015  Takeyuki FUJIOKA  <xibbar@ruby-lang.org>
 
 	* lib/cgi/cookie.rb: Implement HttpOnly flag for cookies.
diff --git a/array.c b/array.c
index 0988a21888..32f9f9ebe4 100644
--- a/array.c
+++ b/array.c
@@ -3692,7 +3692,7 @@ rb_ary_times(VALUE ary, VALUE times)
 
 /*
  *  call-seq:
- *     ary.assoc(obj)   -> new_ary  or  nil
+ *     ary.assoc(obj)   -> element_ary  or  nil
  *
  *  Searches through an array whose elements are also arrays comparing +obj+
  *  with the first element of each contained array using <code>obj.==</code>.
@@ -3727,7 +3727,7 @@ rb_ary_assoc(VALUE ary, VALUE key)
 
 /*
  *  call-seq:
- *     ary.rassoc(obj) -> new_ary or nil
+ *     ary.rassoc(obj) -> element_ary or nil
  *
  *  Searches through the array whose elements are also arrays.
  *