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diff --git a/lib/spack/docs/getting_started.rst b/lib/spack/docs/getting_started.rst
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+++ b/lib/spack/docs/getting_started.rst
@@ -14,6 +14,7 @@ before Spack is run:
1. Python 2 (2.6 or 2.7) or 3 (3.3 - 3.6)
2. A C/C++ compiler
3. The ``git`` and ``curl`` commands.
+4. If using the ``gpg`` subcommand, ``gnupg2`` is required.
These requirements can be easily installed on most modern Linux systems;
on Macintosh, XCode is required. Spack is designed to run on HPC