diff --git a/src/_zkapauthorizer/_plugin.py b/src/_zkapauthorizer/_plugin.py
index 3d5dec0ca9d54a12dce338cd797bead5d24e252a..caa0906615d615fe04f433723eee81a83b8ee2f3 100644
--- a/src/_zkapauthorizer/_plugin.py
+++ b/src/_zkapauthorizer/_plugin.py
@@ -266,7 +266,19 @@ def _create_maintenance_service(reactor, node_config, client_node):
         get_root_nodes=partial(get_root_nodes, client_node, node_config),
         storage_broker=client_node.get_storage_broker(),
         secret_holder=client_node._secret_holder,
-        # Make this configuration
+        # The greater the min lease remaining time, the more of each lease
+        # period is "wasted" by renewing the lease before it has expired.  The
+        # premise of ZKAPAuthorizer's use of leases is that if they expire,
+        # the storage server is free to reclaim the storage by forgetting
+        # about the share.  However, since we do not know of any
+        # ZKAPAuthorizer-enabled storage grids which will garbage collect
+        # shares when leases expire, we have no reason not to use a zero
+        # duration here - for now.
+        #
+        # In the long run, storage servers must run with garbage collection
+        # enabled.  Ideally, before that happens, we will have a system that
+        # doesn't involve trading of wasted lease time against reliability of
+        # leases being renewed before the shares are garbage collected.
         min_lease_remaining=timedelta(seconds=0),
         progress=store.start_lease_maintenance,
         get_now=get_now,