diff --git a/source/install/self-managed-changelog.md b/source/install/self-managed-changelog.md
index 2cd837fe555..f6358f2c0d7 100644
--- a/source/install/self-managed-changelog.md
+++ b/source/install/self-managed-changelog.md
@@ -19,6 +19,7 @@ Latest Mattermost Releases:
 ### Important Upgrade Notes
  - Removed the deprecated Insights feature.
  - Mattermost Boards and various other plugins have transitioned to being fully community supported. See this [forum post](https://forum.mattermost.com/t/upcoming-product-changes-to-boards-and-various-plugins/16669) for more details.
+ - The ``channel_viewed`` websocket event was changed to ``multiple_channels_viewed``, and is now only triggered for channels that actually have unread messages.
 
 **IMPORTANT:** If you upgrade from a release earlier than v8.1, please read the other [Important Upgrade Notes](https://docs.mattermost.com/upgrade/important-upgrade-notes.html).
 
diff --git a/source/upgrade/important-upgrade-notes.rst b/source/upgrade/important-upgrade-notes.rst
index 677f61ef13e..7413dea945c 100644
--- a/source/upgrade/important-upgrade-notes.rst
+++ b/source/upgrade/important-upgrade-notes.rst
@@ -18,6 +18,8 @@ Important Upgrade Notes
 |                                                    +------------------------------------------------------------------------------------------------------------------------------------------------------------------+
 |                                                    | Mattermost Boards and various other plugins have transitioned to being fully community supported. See this                                                       |
 |                                                    | `forum post <https://forum.mattermost.com/t/upcoming-product-changes-to-boards-and-various-plugins/16669>`_ for more details.                                    |
+|                                                    +------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+|                                                    | The ``channel_viewed`` websocket event was changed to ``multiple_channels_viewed``, and is now only triggered for channels that actually have unread messages.   |
 +----------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------+
 | v8.1                                               | In v8.1.2, improved performance on data retention ``DeleteOrphanedRows`` queries.                                                                                |
 |                                                    |                                                                                                                                                                  |