Code review feedback

Author: jonathangreen

README.md

@@ -476,7 +476,7 @@ db = XRayFlaskSqlAlchemy(app)
 
 ### Ignoring httplib requests
 
-If you want to ignore certain httplib requests you can do so based on the hostname or URL that is being requsted. 
+If you want to ignore certain httplib requests you can do so based on the hostname or URL that is being requsted. The hostname is matched using the Python [fnmatch library](https://docs.python.org/3/library/fnmatch.html) which does Unix glob style matching.
 
 ```python
 from aws_xray_sdk.ext.httplib import add_ignored as xray_add_ignored
@@ -494,6 +494,15 @@ xray_add_ignored(urls=['/test-path', '/other-test-path'])
 xray_add_ignored(hostname='myapp.com', urls=['/test-url'])
 ```
 
+If you use a subclass of httplib to make your requests, you can also filter on the class name that initiates the request. This must use the complete package name to do the match.
+
+```python
+from aws_xray_sdk.ext.httplib import add_ignored as xray_add_ignored
+
+# ignore all requests made by botocore
+xray_add_ignored(subclass='botocore.awsrequest.AWSHTTPConnection')
+```
+
 ## License
 
 The AWS X-Ray SDK for Python is licensed under the Apache 2.0 License. See LICENSE and NOTICE.txt for more information.