diff --git a/stream_alert/rule_processor/rules_engine.py b/stream_alert/rule_processor/rules_engine.py
index 291251460..98ef18c7a 100644
--- a/stream_alert/rule_processor/rules_engine.py
+++ b/stream_alert/rule_processor/rules_engine.py
@@ -195,7 +195,7 @@ def match_types_helper(cls, record, normalized_types, datatypes):
         Args:
             record (dict): Parsed data
             normalized_types (dict): Normalized types
-            datatypes (list): normalized types users interested in.
+            datatypes (list): Normalized types users interested in
 
         Returns:
             (dict): A dict of normalized_types with original key names
@@ -219,6 +219,15 @@ def update(cls, results, parent_key, nested_results):
         """Update nested_results by inserting parent key to beginning of list.
         Also combine results and nested_results into one dictionary
 
+        Args:
+            results (dict): A dict of normalized_types with original key names
+            parent_key (str): Parent key of values in nested_results. The values
+                in nested_results are original keys of normalized types.
+            nested_results (dict): A dict of normalized_types from nested record
+
+        Returns:
+            (dict): A dict of normalized_types with original key names
+
         Example 1:
             results = {
                 'ipv4': [['key1']]
diff --git a/tests/unit/stream_alert_rule_processor/test_rule_helpers.py b/tests/unit/stream_alert_rule_processor/test_rule_helpers.py
index d0a5c4e1c..81531dbc0 100644
--- a/tests/unit/stream_alert_rule_processor/test_rule_helpers.py
+++ b/tests/unit/stream_alert_rule_processor/test_rule_helpers.py
@@ -77,49 +77,49 @@ def test_in_network():
 def test_fetch_values_by_datatype():
     """Helpers - Fetch values from a record by normalized type"""
     rec = {
-        u'account': 12345,
-        u'region': '123456123456',
-        u'detail': {
-            u'eventVersion': u'...',
-            u'eventID': u'...',
-            u'eventTime': u'...',
-            u'additionalEventData': {
-                u'MFAUsed': u'Yes',
-                u'LoginTo': u'...',
-                u'MobileVersion': u'No'
+        'account': 12345,
+        'region': '123456123456',
+        'detail': {
+            'eventVersion': '...',
+            'eventID': '...',
+            'eventTime': '...',
+            'additionalEventData': {
+                'MFAUsed': 'Yes',
+                'LoginTo': '...',
+                'MobileVersion': 'No'
             },
-            u'requestParameters': None,
-            u'eventType': u'AwsConsoleSignIn',
-            u'responseElements': {
-                u'ConsoleLogin': u'...'
+            'requestParameters': None,
+            'eventType': 'AwsConsoleSignIn',
+            'responseElements': {
+                'ConsoleLogin': '...'
             },
-            u'awsRegion': u'...',
-            u'eventName': u'ConsoleLogin',
-            u'userIdentity': {
-                u'userName': u'alice',
-                u'type': u'Root',
-                u'principalId': u'12345',
-                u'arn': u'arn:aws:iam::12345:root',
-                u'accountId': u'12345'
+            'awsRegion': '...',
+            'eventName': 'ConsoleLogin',
+            'userIdentity': {
+                'userName': 'alice',
+                'type': 'Root',
+                'principalId': '12345',
+                'arn': 'arn:aws:iam::12345:root',
+                'accountId': '12345'
             },
-            u'eventSource': u'...',
-            u'userAgent': u'...',
-            u'sourceIPAddress': u'1.1.1.2',
-            u'recipientAccountId': u'12345'
+            'eventSource': '...',
+            'userAgent': '...',
+            'sourceIPAddress': '1.1.1.2',
+            'recipientAccountId': '12345'
         },
-        u'detail-type': '...',
-        u'source': '1.1.1.2',
-        u'version': '1.05',
+        'detail-type': '...',
+        'source': '1.1.1.2',
+        'version': '1.05',
         'normalized_types': {
-            'ipv4': [[u'detail', u'sourceIPAddress'], [u'source']],
+            'ipv4': [['detail', 'sourceIPAddress'], ['source']],
             'username': [['detail', 'userIdentity', 'userName']]
         },
-        u'time': '...',
-        u'id': '12345',
-        u'resources': {
-            u'test': u'...'
+        'time': '...',
+        'id': '12345',
+        'resources': {
+            'test': '...'
         }
     }
     assert_equal(len(base.fetch_values_by_datatype(rec, 'ipv4')), 2)
     assert_equal(len(base.fetch_values_by_datatype(rec, 'cmd')), 0)
-    assert_equal(base.fetch_values_by_datatype(rec, 'username'), [u'alice'])
+    assert_equal(base.fetch_values_by_datatype(rec, 'username'), ['alice'])