CONTRIBUTING.md in berkshelf-1.1.6 vs CONTRIBUTING.md in berkshelf-1.2.0.rc1

@@ -40,5 +40,14 @@
 
     $ bundle exec guard start
 
 See [here](https://github.com/tdegrunt/vagrant-chef-server-bootstrap) for a
 quick way to get a testing chef server up.
+
+### Debugging Issues
+By default, Berkshelf will only give you the top-level output from a failed command. If you're working deep inside the core, an error like:
+
+    Berkshelf Error: wrong number of arguments (2 for 1)
+
+isn't exactly helpful...
+
+Specify the `BERKSHELF_DEBUG` flag when running your command to see a full stack trace and other helpful debugging information.