More type annotations.

1 files changed, 2 insertions, 2 deletions

diff --git a/base_presence.py b/base_presence.py
index 612193e..3ceddb3 100755
--- a/base_presence.py
+++ b/base_presence.py
@@ -4,7 +4,7 @@ import datetime
 from collections import defaultdict
 import logging
 import re
-from typing import Dict, List, Set
+from typing import Dict, List, Optional, Set
 import warnings
 
 # Note: this module is fairly early loaded.  Be aware of dependencies.
@@ -75,7 +75,7 @@ class PresenceDetection(object):
         ] = defaultdict(dict)
         self.names_by_mac: Dict[str, str] = {}
         self.dark_locations: Set[Location] = set()
-        self.last_update = None
+        self.last_update: Optional[datetime.datetime] = None
 
     def maybe_update(self) -> None:
         if self.last_update is None: