RELEASING.md in guard-rack-2.1.0 vs RELEASING.md in guard-rack-2.1.1

@@ -10,9 +10,11 @@
 ```
 bundle install
 rake
 ```
 
+Check that the current master branch can successfully run [grape-on-rack](https://github.com/dblock/grape-on-rack).
+
 Check that the last build succeeded in [Travis CI](https://travis-ci.org/dblock/guard-rack) for all supported platforms.
 
 Increment the version, modify [lib/guard/rack/version.rb](lib/guard/rack/version.rb).
 
 *  Increment the third number if the release has bug fixes and/or very minor features, only (eg. change `0.5.1` to `0.5.2`).