{"action":"created","comment":{"url":"https://api.github.com/repos/matrix-org/matrix-doc/pulls/comments/42229936","id":42229936,"diff_hunk":"@@ -854,46 +854,31 @@ See `Room Events`_ for more information on these events.\n \n Room aliases\n ~~~~~~~~~~~~\n-.. NOTE::\n-  This section is a work in progress.\n-\n-Room aliases can be created by sending a ``PUT /directory/room/<room alias>``::\n-\n-  {\n-    \"room_id\": <room id>\n-  }\n-\n-They can be deleted by sending a ``DELETE /directory/room/<room alias>`` with\n-no content. Only some privileged users may be able to delete room aliases, e.g.\n-server admins, the creator of the room alias, etc. This specification does not\n-outline the privilege level required for deleting room aliases.\n-\n-As room aliases are scoped to a particular home server domain name, it is\n-likely that a home server will reject attempts to maintain aliases on other\n-domain names. This specification does not provide a way for home servers to\n-send update requests to other servers.\n \n-Rooms store a *partial* list of room aliases via the ``m.room.aliases`` state\n+Room aliases are pointers to room IDs. They exist outside the context of a room.\n+Rooms can store a *partial* list of room aliases via the ``m.room.aliases`` state\n event. This alias list is partial because it cannot guarantee that the alias\n list is in any way accurate or up-to-date, as room aliases can point to\n different room IDs over time. Crucially, the aliases in this event are\n **purely informational** and SHOULD NOT be treated as accurate. They SHOULD\n be checked before they are used or shared with another user. If a room\n appears to have a room alias of ``#alias:example.com``, this SHOULD be checked\n-to make sure that the room's ID matches the ``room_id`` returned from the\n+to make sure that the room's ID matches the ``room_id`` returned from the directory\n request.\n \n-Room aliases can be checked in the same way they are resolved; by sending a\n-``GET /directory/room/<room alias>``::\n \n-  {\n-    \"room_id\": <room id>,\n-    \"servers\": [ <domain>, <domain2>, <domain3> ]\n-  }\n+As room aliases are scoped to a particular homeserver domain it is likely that 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clarified IRL, rephrase that homeservers MUST reject attempts to maintain aliases on other 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