make it clear how status messages appears

jtarchie · jtarchie · commit 6b8e178fdf24 · 2016-03-30T21:13:17.000-06:00
diff --git a/README.md b/README.md
@@ -72,7 +72,9 @@ Set the status message for `concourse-ci` context on specified pull request.
 
 * `status`: *Required.* The status of success, failure, error, or pending.
 
-* `context`: *Optional.* The context on the specified pull request (defaults to `concourse-ci`)
+* `context`: *Optional.* The context on the specified pull request
+  (defaults to `status`). Any context will be prepended with `concourse-ci`, so
+  a status of `unit-tests` will appear as `concourse-ci/unit-tests` on Github.
 
 ## Example pipeline
 
