service/forum.md

@@ -141,6 +141,27 @@ Within the container its possible to restart the Discourse daemon using:
 
     sv restart unicorn
 
+## Read-only mode
+
+It's possible to enable "read-only" mode on the forum, which will prevent any
+changes and will block and new topic, replies, messages, settings changes, etc.
+
+To enable it, navigate to the `Admin` section, then `Backups` and click the
+button labeled `Enable read-only`.
+
+It's also possible to enable a "partial read-only" mode which is like normal
+"read-only" except it allows administrators to make changes. Enabling this mode
+must be done via the rails console:
+
+    Discourse.enable_readonly_mode(Discourse::STAFF_WRITES_ONLY_MODE_KEY)
+
+To disable it:
+
+    Discourse.disable_readonly_mode(Discourse::STAFF_WRITES_ONLY_MODE_KEY)
+
+The documentation for this feature is found at
+https://meta.discourse.org/t/partial-read-only-mode/210401/18
+
 ## Pager playbook
 
 ## Disaster recovery