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-rw-r--r--docs/admin_api/purge_history_api.rst2
1 files changed, 2 insertions, 0 deletions
diff --git a/docs/admin_api/purge_history_api.rst b/docs/admin_api/purge_history_api.rst
index 986efe40f9..08b3306366 100644
--- a/docs/admin_api/purge_history_api.rst
+++ b/docs/admin_api/purge_history_api.rst
@@ -4,6 +4,8 @@ Purge History API
 The purge history API allows server admins to purge historic events from their
 database, reclaiming disk space.
 
+**NB!** This will not delete local events (locally sent messages content etc) from the database, but will remove lots of the metadata about them and does dramatically reduce the on disk space usage
+
 Depending on the amount of history being purged a call to the API may take
 several minutes or longer. During this period users will not be able to
 paginate further back in the room from the point being purged from.