$ao = ActivityObject::fromGroup($group);
- $this->addAuthorRaw($ao->asString('author').
- $ao->asString('activity:subject'));
+ $this->addAuthorRaw($ao->asString('author'));
+
+ $depMsg = 'Deprecation warning: activity:subject is present '
+ . 'only for backward compatibility. It will be '
+ . 'removed in the next version of StatusNet.';
+
+ $this->addAuthorRaw(
+ "<!--$depMsg-->\n"
+ . $ao->asString('activity:subject')
+ );
$this->addLink($group->homeUrl());
}