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diff --git a/ChangeLog b/ChangeLog
index 687327d..61d2405 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -2,6 +2,9 @@ ChangeLog for Pylint
 --------------------
 
 --
+    * Fix unused-argument false positive when the "+=" operator is used.
+      Closes issue #518.
+	
     * Don't emit import-error for ignored modules. PyLint will not emit import
       errors for any import which is, or is a subpackage of, a module in
       the ignored-modules list. Closes issue #223.