README.md in litmus_paper-1.2.0 vs README.md in litmus_paper-1.3.0

@@ -177,9 +177,15 @@
   * timeout (defaults to 5s)
 
 - `big_brother_service` (`Metric::BigBrotherService`): Used in conjunction with [Big Brother](https://github.com/braintree/big_brother), reports health based on the overall health of another load balanced service.
   * service
 
+- `haproxy_backends_health` (`Metric::HaproxyBackendsHealth`): Checks UP/DOWN status across a set of servers in a Haproxy cluster and computes a litmus weight based on the HAProxy weights of the servers which have an UP status.
+  * weight (0-100)
+  * haproxy socket
+  * cluster
+  * timeout (defaults to 2s)
+
 ### HAProxy agent check configuration
 
 Litmus paper can also report health checks in HAProxy agent check format. The agent check functionality takes the health data from a service health check, and exposes it on a different port in the format HAProxy expects.
 
 There are no additional configuration files for the agent check, since all options are specified on the command line. Services are configured as normal litmus services as described above.