docs: update WIP pacts description

README.md

@@ -442,7 +442,7 @@ See the [docs](https://docs.pact.io/pending) and this [article](http://blog.pact
 
 #### WIP Pacts
 
-WIP Pacts builds upon pending pacts, enabling provider tests to pull in _any_ contracts applicable to the provider regardless of the `tag` it was given. This is useful, because often times consumers won't follow the exact same tagging convention and so their workflow would be interrupted. This feature enables any pacts determined to be "work in progress" to be verified by the Provider, without causing a build failure.
+WIP Pacts builds upon pending pacts, enabling provider tests to pull in _any_ contracts applicable to the provider regardless of the `tag` it was given. This is useful, because often times consumers won't follow the exact same tagging convention and so their workflow would be interrupted. This feature enables any pacts determined to be "work in progress" to be verified by the Provider, without causing a build failure. You can enable this behaviour by specifying a valid `time.Time` field for `IncludeWIPPactsSince`. This sets the start window for which new WIP pacts will be pulled down for verification, regardless of the tag.
 
 See the [docs](https://docs.pact.io/wip) and this [article](http://blog.pact.io/2020/02/24/introducing-wip-pacts/) for more background.