TESTING.md in airbrake-3.1.2 vs TESTING.md in airbrake-3.1.3

@@ -20,9 +20,17 @@
 Finally, this test suite runs against many rails versions. If you
 prefer to run it against specific version hit
 
     rake cucumber:rails:<VERSION>
 
+You can also specify to test only against the certain frameworks we
+support (rack, rake and sinatra) by executing
+
+    rake cucumber:<FRAMEWORK>
+
+This tasks are not printed out with `rake -T` since they're added
+dynamically in the Rakefile.
+
 
 For Maintainers
 ================
 
 When developing the Airbrake gem, be sure to use the integration test against an existing project on staging before pushing to master.