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diff --git a/doc/contributing.rst b/doc/contributing.rst
index 165ae40b..e9d2c3a4 100644
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@@ -50,6 +50,11 @@ these steps:
$ python3 -m pip install -r requirements/dev.pip
+ If this fails due to incorrect or missing hashes, use
+ ``dev.in`` instead::
+
+ $ python3 -m pip install -r requirements/dev.in
+
#. Install a number of versions of Python. Coverage.py supports a range
of Python versions. The more you can test with, the more easily your code
can be used as-is. If you only have one version, that's OK too, but may