diff --git a/CHANGES b/CHANGES
index 1f4b2fb09..a31de0e1c 100644
--- a/CHANGES
+++ b/CHANGES
@@ -14,6 +14,8 @@ yet to be released
   not a date string. (``#414``)
 - Fix a bug in ``TypeConversionDict`` where errors are not propagated when
   using the converter. (``#1102``)
+- ``Authorization.qop`` is a string instead of a set, to comply with
+  RFC 2617. (``#984``)
 
 Version 0.12.1
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