diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 21f0014..81bb0b0 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -17,6 +17,7 @@
 0. If you add new functions, **add documentation** (comment above)
   * Wrap function arguments in `+` signs (e.g. `the +type+ is used for…`)
 0. If you add new functions, **add tests** (test/test.js)
+0. If you fixed an issue, **add a test** that would catch this issue
 0. Run **tests** (`npm test`)
 0. Make sure as much of your code as possible is **covered by tests**
 0. Double check that your pull request is **awesome** :)
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