diff --git a/ChangeLog b/ChangeLog
index 02260976f46197..15f164e096c5eb 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Thu Dec 15 10:44:54 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* array.c (rb_ary_reject_bang, rb_ary_delete_if): update rdoc.
+	  documentation from Thomas Leitner <t_leitner AT gmx.at> in
+	  [ruby-core:41616].  [Bug #5752]
+
 Thu Dec 15 10:10:43 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* test/ruby/test_require.rb (test_race_exception): get rid of
diff --git a/array.c b/array.c
index cfe44a901564fe..01cabc87b9813c 100644
--- a/array.c
+++ b/array.c
@@ -2643,6 +2643,8 @@ ary_reject_bang(VALUE ary)
  *  Equivalent to Array#delete_if, deleting elements from
  *  +self+ for which the block evaluates to true, but returns
  *  <code>nil</code> if no changes were made.
+ *  The array is changed instantly every time the block is called and
+ *  not after the iteration is over.
  *  See also Enumerable#reject and Array#delete_if.
  *
  *  If no block is given, an enumerator is returned instead.
@@ -2687,6 +2689,8 @@ rb_ary_reject(VALUE ary)
  *
  *  Deletes every element of +self+ for which +block+ evaluates
  *  to true.
+ *  The array is changed instantly every time the block is called and
+ *  not after the iteration is over.
  *  See also Array#reject!
  *
  *  If no block is given, an enumerator is returned instead.
diff --git a/test/ruby/test_array.rb b/test/ruby/test_array.rb
index 8f1d53d933f58a..28d3e4156b55be 100644
--- a/test/ruby/test_array.rb
+++ b/test/ruby/test_array.rb
@@ -610,7 +610,7 @@ def test_delete_if
 
     bug2545 = '[ruby-core:27366]'
     a = @cls[ 5, 6, 7, 8, 9, 10 ]
-    assert_equal(9, a.delete_if {|i| break i if i > 8; i < 7})
+    assert_equal(9, a.delete_if {|i| break i if i > 8; assert_equal(a[0], i) || true if i < 7})
     assert_equal(@cls[7, 8, 9, 10], a, bug2545)
   end
 
@@ -1098,7 +1098,7 @@ def test_reject!
 
     bug2545 = '[ruby-core:27366]'
     a = @cls[ 5, 6, 7, 8, 9, 10 ]
-    assert_equal(9, a.reject! {|i| break i if i > 8; i < 7})
+    assert_equal(9, a.reject! {|i| break i if i > 8; assert_equal(a[0], i) || true if i < 7})
     assert_equal(@cls[7, 8, 9, 10], a, bug2545)
   end