diff --git a/1to2.md b/1to2.md
index b95deaef..6802d854 100644
--- a/1to2.md
+++ b/1to2.md
@@ -50,6 +50,9 @@ If you import big calendars or address books into Radicale 2.x.x the first
 request might take a long time, because it has to initialize its internal
 caches. Clients can time out, subsequent requests will be much faster.
 
+You can check the imported storage for errors by starting Radicale >= 2.1.5
+with the ``--verify-storage`` argument.
+
 You can install version 1.1.6 with:
 
 ```shell