I saw following item in release-9.5.sgml:
<!--
2015-06-21 [ad89a5d] Alvaro..: Add transforms to pg_get_object_address and fr..
--> <para> Support comments on <link linkend="SQL-CREATEDOMAIN">domain constraints</> (Álvaro
Herrera) </para> </listitem>
It seems the release note has nothing to do with the commit. Also,
commenting on DOMAIN constraints is not new in 9.5, I think.
Best regards,
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese:http://www.sraoss.co.jp