diff --git a/ChangeLog b/ChangeLog
index d5ea67ed86..f246398162 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Mar  5 16:58:43 2015  Kazuki Tanaka  <gogotanaka@ruby-lang.org>
+
+	* hash.c: [DOC] #delete method actually returns nil, if the key
+	  is not found. [fix GH-844][ci skip] Patch by @ivdma
+
 Wed Mar  5 12:22:23 2015  Kazuki Tanaka  <gogotanaka@ruby-lang.org>
 
 	* math.c: refactoring: remove unnecessary variable d0 to unify code
diff --git a/hash.c b/hash.c
index c4a2c0f634..6ab27e8a77 100644
--- a/hash.c
+++ b/hash.c
@@ -1057,8 +1057,8 @@ rb_hash_delete(VALUE hash, VALUE key)
  *     hsh.delete(key) {| key | block }  -> value
  *
  *  Deletes the key-value pair and returns the value from <i>hsh</i> whose
- *  key is equal to <i>key</i>. If the key is not found, returns the
- *  <em>default value</em>. If the optional code block is given and the
+ *  key is equal to <i>key</i>. If the key is not found, it returns
+ *  <em>nil</em>. If the optional code block is given and the
  *  key is not found, pass in the key and return the result of
  *  <i>block</i>.
  *