diff --git a/ChangeLog b/ChangeLog
index 769c0f12ba..76a8e0b543 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Oct 13 10:37:31 2016  Eric Wong  <e@80x24.org>
+
+	* doc/extension.rdoc: wording fix
+
 Thu Oct 13 00:39:08 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* test/ruby/test_array.rb (test_sort_bang_with_freeze): make a
diff --git a/doc/extension.rdoc b/doc/extension.rdoc
index 764cc54095..6863665d19 100644
--- a/doc/extension.rdoc
+++ b/doc/extension.rdoc
@@ -1854,8 +1854,7 @@ keyword in C.  RB_GC_GUARD has the following advantages:
 
 3. "volatile" implementations may be buggy/inconsistent in some
    compilers and architectures. RB_GC_GUARD is customizable for broken
-   systems/compilers without those without negatively affecting other
-   systems.
+   systems/compilers without negatively affecting other systems.
 
 :enddoc: Local variables:
 :enddoc: fill-column: 70