diff --git a/admin_manual/configuration_server/activity_configuration.rst b/admin_manual/configuration_server/activity_configuration.rst
index 1203657bc..c61a447b8 100644
--- a/admin_manual/configuration_server/activity_configuration.rst
+++ b/admin_manual/configuration_server/activity_configuration.rst
@@ -50,6 +50,15 @@ like in normal shares when set to ``true``.
     2. Users that had access to a groupfolder, share or external storage can see activities in their stream and emails that happen after they are removed until they login again
     3. Users that are newly added to a groupfolder, share or external storage can not see activities in their stream nor emails that happen after they are added until they login again
 
+.. _label-activities-externalstorages:
+
+Activities in external storages
+-------------------------------
+
+When external storages have been configured in a way that multiple users have access to it,
+you can use the config flag ``activity_use_cached_mountpoints`` that makes activities
+with external storages work like in normal shares when set to ``true``.
+
 Better scheduling of activity emails
 ------------------------------------