diff --git a/ChangeLog b/ChangeLog
index 88c35076f6..5ea8a4d6e3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri May  8 15:05:57 2015  SHIBATA Hiroshi  <hsbt@ruby-lang.org>
+
+	* doc/syntax/control_expressions.rdoc: fix a missing "a"
+	  [fix GH-888][ci skip] Patch by @riffraff
+
 Fri May  8 12:11:33 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* vm_eval.c (rb_method_call_status): resolve refined method entry
diff --git a/doc/syntax/control_expressions.rdoc b/doc/syntax/control_expressions.rdoc
index 0efc1668ad..76ca3b47be 100644
--- a/doc/syntax/control_expressions.rdoc
+++ b/doc/syntax/control_expressions.rdoc
@@ -441,7 +441,7 @@ for proper usage of +retry+.
 
 == Flip-Flop
 
-The flip-flop is rarely seen conditional expression.  It's primary use is
+The flip-flop is a rarely seen conditional expression.  It's primary use is
 for processing text from ruby one-line programs used with <code>ruby -n</code>
 or <code>ruby -p</code>.