diff --git a/doc/045_working_with_repos.rst b/doc/045_working_with_repos.rst
index 82a20bac4..4f0e62074 100644
--- a/doc/045_working_with_repos.rst
+++ b/doc/045_working_with_repos.rst
@@ -136,6 +136,11 @@ or the environment variable ``$RESTIC_FROM_KEY_HINT``.
     repository. You can avoid this limitation by using the rclone backend
     along with remotes which are configured in rclone.
 
+.. note:: You may lose up to 10 minutes of progress if the ``copy`` command is
+    aborted, because the repository index is only updated from time to time.
+    If you don't want to lose 10 minutes, you can run ``rebuild-index`` after your
+    ``copy`` command has aborted.
+
 .. _copy-filtering-snapshots:
 
 Filtering snapshots to copy