matrix-spec-proposals/content/client-server-api/modules/mentions.md

---
type: module
weight: 300
---

### User, room, and group mentions

This module allows users to mention other users, rooms, and groups
within a room message. This is achieved by including a [matrix.to
URI](/appendices/#matrixto-navigation) in the HTML body of an
[m.room.message](#mroommessage) event. This module does not have any server-specific
behaviour to it.

Mentions apply only to [m.room.message](#mroommessage) events where the `msgtype` is
`m.text`, `m.emote`, or `m.notice`. The `format` for the event must be
`org.matrix.custom.html` and therefore requires a `formatted_body`.

To make a mention, reference the entity being mentioned in the
`formatted_body` using an anchor, like so:

```json
{
    "body": "Hello Alice!",
    "msgtype": "m.text",
    "format": "org.matrix.custom.html",
    "formatted_body": "Hello <a href='https://matrix.to/#/@alice:example.org'>Alice</a>!"
}
```

#### Client behaviour

In addition to using the appropriate `matrix.to URI` for the mention,
clients should use the following guidelines when making mentions in
events to be sent:

-   When mentioning users, use the user's potentially ambiguous display
    name for the anchor's text. If the user does not have a display
    name, use the user's ID.
-   When mentioning rooms, use the canonical alias for the room. If the
    room does not have a canonical alias, prefer one of the aliases
    listed on the room. If no alias can be found, fall back to the room
    ID. In all cases, use the alias/room ID being linked to as the
    anchor's text.
-   When referencing groups, use the group ID as the anchor's text.

The text component of the anchor should be used in the event's `body`
where the mention would normally be represented, as shown in the example
above.

Clients should display mentions differently from other elements. For
example, this may be done by changing the background color of the
mention to indicate that it is different from a normal link.

If the current user is mentioned in a message (either by a mention as
defined in this module or by a push rule), the client should show that
mention differently from other mentions, such as by using a red
background color to signify to the user that they were mentioned.

When clicked, the mention should navigate the user to the appropriate
room, group, or user information.