diff --git a/pyfcm/__meta__.py b/pyfcm/__meta__.py
index 4465f4c..932e00d 100644
--- a/pyfcm/__meta__.py
+++ b/pyfcm/__meta__.py
@@ -2,7 +2,7 @@
 __summary__ = "Python client for FCM - Firebase Cloud Messaging (Android, iOS and Web)"
 __url__ = "https://github.com/olucurious/pyfcm"
 
-__version__ = "2.0.2"
+__version__ = "2.0.3"
 
 __author__ = "Emmanuel Adegbite"
 __email__ = "olucurious@gmail.com"
diff --git a/pyfcm/baseapi.py b/pyfcm/baseapi.py
index 19bd804..7fb334f 100644
--- a/pyfcm/baseapi.py
+++ b/pyfcm/baseapi.py
@@ -192,7 +192,9 @@ def parse_response(self, response):
                 return response.json()
 
         elif response.status_code == 401:
-            raise ("There was an error authenticating the sender account")
+            raise AuthenticationError(
+                "There was an error authenticating the sender account"
+            )
         elif response.status_code == 400:
             raise InvalidDataError(response.text)
         elif response.status_code == 404:
diff --git a/pyfcm/fcm.py b/pyfcm/fcm.py
index e340f40..ca3f945 100644
--- a/pyfcm/fcm.py
+++ b/pyfcm/fcm.py
@@ -5,7 +5,7 @@
 class FCMNotification(BaseAPI):
     def notify(
         self,
-        fcm_token,
+        fcm_token=None,
         notification_title=None,
         notification_body=None,
         notification_image=None,
@@ -23,7 +23,7 @@ def notify(
         Send push notification to a single device
 
         Args:
-            fcm_token (str): FCM device registration ID
+            fcm_token (str, optional): FCM device registration ID
             notification_title (str, optional): Message title to display in the notification tray
             notification_body (str, optional): Message string to display in the notification tray
             notification_image (str, optional): Icon that appears next to the notification