diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 021d2eb31..cdc094db6 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -9,11 +9,15 @@ Contribution examples:
If you could kindly send a PR to ChainerRL, please make sure all the tests successfully pass.
+When contributing to ChainerRL, we highly recommend installing the additional set of developer requirements, which may be necessary for testing:
+```
+pip install -r requirements-dev.txt
+```
+
## Testing
-To test chainerrl modules, install and run `pytest`. Pass `-m "not gpu"` to skip tests that require gpu. E.g.
+To test chainerrl modules, install and run `pytest` (after installing `pytest`). Pass `-m "not gpu"` to skip tests that require gpu. E.g.
```
-$ pip install pytest
$ pytest -m "not gpu"
```
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