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# Contributing to Spack
-Before contributing to Spack you should read the
+All contributions to Spack must be made under both the Apache License,
+Version 2.0 (Apache-2.0) and the MIT license (MIT).
+
+Before contributing to Spack, you should read the
[Contribution Guide](https://spack.readthedocs.io/en/latest/contribution_guide.html),
which is maintained as part of Spack's documentation.