diff --git a/awsiot/iotshadow.py b/awsiot/iotshadow.py
index a6c28ef7..61b3c6ca 100644
--- a/awsiot/iotshadow.py
+++ b/awsiot/iotshadow.py
@@ -1187,21 +1187,24 @@ class ShadowDeltaUpdatedEvent(awsiot.ModeledClass):
     All attributes are None by default, and may be set by keyword in the constructor.
 
     Keyword Args:
+        client_token (str): An opaque token used to correlate requests and responses.  Present only if a client token was used in the request.
         metadata (typing.Dict[str, typing.Any]): Timestamps for the shadow properties that were updated.
         state (typing.Dict[str, typing.Any]): Shadow properties that were updated.
         timestamp (datetime.datetime): The time the event was generated by AWS IoT.
         version (int): The current version of the document for the device's shadow.
 
     Attributes:
+        client_token (str): An opaque token used to correlate requests and responses.  Present only if a client token was used in the request.
         metadata (typing.Dict[str, typing.Any]): Timestamps for the shadow properties that were updated.
         state (typing.Dict[str, typing.Any]): Shadow properties that were updated.
         timestamp (datetime.datetime): The time the event was generated by AWS IoT.
         version (int): The current version of the document for the device's shadow.
     """
 
-    __slots__ = ['metadata', 'state', 'timestamp', 'version']
+    __slots__ = ['client_token', 'metadata', 'state', 'timestamp', 'version']
 
     def __init__(self, *args, **kwargs):
+        self.client_token = kwargs.get('client_token')
         self.metadata = kwargs.get('metadata')
         self.state = kwargs.get('state')
         self.timestamp = kwargs.get('timestamp')
@@ -1215,6 +1218,9 @@ def __init__(self, *args, **kwargs):
     def from_payload(cls, payload):
         # type: (typing.Dict[str, typing.Any]) -> ShadowDeltaUpdatedEvent
         new = cls()
+        val = payload.get('clientToken')
+        if val is not None:
+            new.client_token = val
         val = payload.get('metadata')
         if val is not None:
             new.metadata = val
@@ -1711,4 +1717,3 @@ def __init__(self, *args, **kwargs):
         # for backwards compatibility, read any arguments that used to be accepted by position
         for key, val in zip(['thing_name'], args):
             setattr(self, key, val)
-
diff --git a/samples/shadow.py b/samples/shadow.py
index 9e0f9bf8..2b390361 100644
--- a/samples/shadow.py
+++ b/samples/shadow.py
@@ -154,6 +154,8 @@ def on_shadow_delta_updated(delta):
                 return
             else:
                 print("  Delta reports that desired value is '{}'. Changing local value...".format(value))
+                if (delta.client_token is not None):
+                    print ("  ClientToken is: " + delta.client_token)
                 change_shadow_value(value)
         else:
             print("  Delta did not report a change in '{}'".format(shadow_property))