Getting help with a specific exercise.

CONTRIBUTING.md

@@ -50,6 +50,9 @@ We are working to improve this document, and if you find any part of it confusin
 ### ... with a specific exercise 
 
 * If a particular exercise is giving you grief, ask for help in our [online support chat](https://gitter.im/exercism/support).
+- If there's a defect in the **instructions** of the exercise, you can make a difference by [filing a bug report]() in the [`exercism/x-common` repository](https://github.com/exercism/x-common/issues/new).
+  - After reporting the problem, if you have the time and the desire, you can *really* help by [fixing it](#-organizing-stuff).
+- If there's a defect in the **tests** or **starter code** of the exercise, you can help by [filing a bug report]() in the "Issues" section of the [corresponding language repository](http://exercism.io/repositories).
 - You can ask for help within the track:
   1. `exercism submit` the code you have.
   -  View your new submission (the previous command hands you that link)
@@ -67,10 +70,16 @@ We are working to improve this document, and if you find any part of it confusin
 
 ### ... making the website better 
 
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 ### ... improving the command-line client (CLI) 
 
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 ### ... a brand-new exercise for Exercism 
 
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 ### ... improving an existing exercise 
 
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 ### ... organizing stuff
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 ### ... fluency in a particular programming language
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 ### ... web programming
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 ### ... Ruby on Rails
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 ### ... Go
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 ### ... web design