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-rw-r--r--CONTRIBUTING.md1
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diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
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@@ -14,6 +14,7 @@ things in mind before submitting your pull request:
* Don't mix several features or bug-fixes in one pull request
* Create a meaningful commit message
* Explain your change (i.e. with a link to the issue you are fixing)
+* Use mrbgem to provide non ISO features (classes, modules and methods) unless you have a special reason to implement them in the core
## Coding conventions