added in more comments

index.py

@@ -18,16 +18,16 @@ def lambda_handler(event, context):
     print(raw_message) #CW Logs prints JSON prettier. Printing this for easier recreation. 
 
     try: 
-        try:
+        try: # Normally the event comes through as json
             source_message = json.loads(raw_message)
-        except: # If the event comes through as a dict, take it as it comes
+        except: # If the event comes through as a dict, take it as it comes (this is usually when testing locally)
             source_message = raw_message
         # Check for source. Transform it to "Dome9" format if it's not originating from Dome9. 
         # This expects that GD is triggering lambda via SNS. This is neeeded for running cross-region GD events. 
         if "source" in source_message and source_message["source"] == "aws.guardduty": # GuardDuty event source via CW Events
             text_output_array.append("Event Source: GuardDuty\n")
             gd_transform_module = importlib.import_module('transform_gd_event')
-            found_action, text_output, source_message = gd_transform_module.transform_gd_event(source_message)
+            found_action, text_output, source_message = gd_transform_module.transform_gd_event(source_message) # Transform the event from GuardDuty to the Dome9 format
             text_output_array.append(text_output)
             if not found_action:
                 print(text_output_array)
@@ -51,7 +51,7 @@ def lambda_handler(event, context):
         text_output_array.append("Handle_event failed\n")
         text_output_array.append(str(e))
 
-
+    # After the bot is called, post it to SNS for output logging
     if SNS_TOPIC_ARN != '' and post_to_sns:
         sendEvent(text_output_array,SNS_TOPIC_ARN)