diff --git a/doc/source/user/manage-volumes.rst b/doc/source/user/manage-volumes.rst
index d2d7302b9d..e2a4bd0d8e 100644
--- a/doc/source/user/manage-volumes.rst
+++ b/doc/source/user/manage-volumes.rst
@@ -161,7 +161,8 @@ Delete a volume
 ~~~~~~~~~~~~~~~
 
 When you delete an instance, the data in its attached volumes is not
-deleted.
+deleted (unless you chose delete volume on instance delete when creating an
+instance).
 
 #. Log in to the dashboard.