diff --git a/NEWS b/NEWS
index 35180a00a4..68266322f6 100644
--- a/NEWS
+++ b/NEWS
@@ -43,6 +43,9 @@ with all sufficient information, see the ChangeLog file.
 
     Return an enumerator if no block is given.
 
+    Note that #map and #collect still return an array unlike Ruby 1.9
+    to keep compatibility.
+
   * Array#pop
   * Array#shift
 
@@ -108,6 +111,9 @@ with all sufficient information, see the ChangeLog file.
 
     Return an enumerator if no block is given.
 
+    Note that #map and #collect still return an array unlike Ruby 1.9
+    to keep compatibility.
+
   * Enumerable#inject
 
     Accepts a binary operator instead of a block.