diff --git a/README.rst b/README.rst
index 9bd988e..c9ff2bf 100644
--- a/README.rst
+++ b/README.rst
@@ -182,7 +182,8 @@ You have to be a channel operator (+o) to use admin commands.
   Removes active entries for specified track(s)
 
 ~newday
-  Removes now/next/location entries, to be run at the start of a new day
+  Removes existing now/next/location/presence entries. This command is
+  meant to be run at the start of a new day
 
 ~motd LEVEL MESSAGE
   Adds a message of the day on top of the rendered page. Level must be one of
diff --git a/ptgbot/db.py b/ptgbot/db.py
index f944da0..5dc0e36 100644
--- a/ptgbot/db.py
+++ b/ptgbot/db.py
@@ -191,6 +191,7 @@ class PTGDataBase():
         self.data['now'] = OrderedDict()
         self.data['next'] = OrderedDict()
         self.data['location'] = OrderedDict()
+        self.data['last_check_in'] = OrderedDict()
         self.clean_motd()
 
     def empty(self):