diff --git a/Adafruit_IO/errors.py b/Adafruit_IO/errors.py
index 52e1590..52b3fd7 100644
--- a/Adafruit_IO/errors.py
+++ b/Adafruit_IO/errors.py
@@ -22,16 +22,6 @@
 import json, requests
 from paho.mqtt.client import error_string
 
-# MQTT RC Error Types *** OBSOLETE *** 
-# See error_string() in client.py and enums.py from paho instead
-# https://github.com/eclipse/paho.mqtt.python/blob/4eeb431f5ae72b42474cec42641fca1daa91c4b0/src/paho/mqtt/client.py#L291-L404
-MQTT_ERRORS   = [ 'Connection successful',
-                  'Incorrect protocol version',
-                  'Invalid Client ID',
-                  'Server unavailable ',
-                  'Bad username or password',
-                  'Not authorized' ]
-
 class AdafruitIOError(Exception):
     """Base class for all Adafruit IO request failures."""
     pass
diff --git a/Adafruit_IO/mqtt_client.py b/Adafruit_IO/mqtt_client.py
index 4a16b20..198b4d6 100644
--- a/Adafruit_IO/mqtt_client.py
+++ b/Adafruit_IO/mqtt_client.py
@@ -59,7 +59,7 @@ def __init__(self, username, key, service_host='io.adafruit.com', secure=True):
         self.on_disconnect = None
         self.on_message    = None
         self.on_subscribe  = None
-        # Initialize MQTT client.
+        # Initialize v1 MQTT client.
         self._client = mqtt.Client(mqtt.CallbackAPIVersion.VERSION1)
         if secure:
             self._client.tls_set_context()
diff --git a/examples/mqtt/mqtt_viewall.py b/examples/mqtt/mqtt_viewall.py
index 36c2250..31c3a9e 100644
--- a/examples/mqtt/mqtt_viewall.py
+++ b/examples/mqtt/mqtt_viewall.py
@@ -54,7 +54,7 @@ def on_message(client, userdata, msg):
     print('Received on {0}: {1}'.format(msg.topic, msg.payload.decode('utf-8')))
 
 
-# Create MQTT client and connect to Adafruit IO.
+# Create Paho v1 MQTT client and connect to Adafruit IO.
 client = mqtt.Client(mqtt.CallbackAPIVersion.VERSION1)
 client.username_pw_set(USERNAME, KEY)
 client.on_connect = on_connect