diff --git a/ChangeLog b/ChangeLog
index 6be1c45802..27af2cdad2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Tue Jun 28 09:56:29 2016  Stefan Schussler  <mail@stefanschuessler.de>
+
+	* object.c (rb_mod_eqq): [DOC] Fix typo in RDoc.  [Fix GH-1393]
+
 Tue Jun 28 02:41:32 2016  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* insns.def (opt_plus): use `- 1` instead of `& (~1)` to allow
diff --git a/object.c b/object.c
index cc674b1584..41cdbb69d2 100644
--- a/object.c
+++ b/object.c
@@ -1523,7 +1523,7 @@ rb_mod_freeze(VALUE mod)
  *     mod === obj    -> true or false
  *
  *  Case Equality---Returns <code>true</code> if <i>obj</i> is an
- *  instance of <i>mod</i> or and instance of one of <i>mod</i>'s descendants.
+ *  instance of <i>mod</i> or an instance of one of <i>mod</i>'s descendants.
  *  Of limited use for modules, but can be used in <code>case</code> statements
  *  to classify objects by class.
  */