diff --git a/src/ZEO/StorageServer.py b/src/ZEO/StorageServer.py
index 35b6ddf5b..40d726ca4 100644
--- a/src/ZEO/StorageServer.py
+++ b/src/ZEO/StorageServer.py
@@ -1080,6 +1080,7 @@ def close(self, join_timeout=1):
         for sid, zeo_storages in self.zeo_storages_by_storage_id.items():
             for zs in zeo_storages[:]:
                 try:
+                    logger.debug("Closing %s", zs.connection)
                     zs.connection.call_soon_threadsafe(
                         zs.connection.close)
                 except Exception:
diff --git a/src/ZEO/asyncio/server.py b/src/ZEO/asyncio/server.py
index 82913a0aa..d3bb8a4cb 100644
--- a/src/ZEO/asyncio/server.py
+++ b/src/ZEO/asyncio/server.py
@@ -34,6 +34,7 @@ def __init__(self, loop, addr, zeo_storage):
 
     closed = False
     def close(self):
+        logger.debug("Closing server protocol")
         if not self.closed:
             self.closed = True
             if self.transport is not None: