You need a gpg key to do a release
diff --git a/docs/doing-a-release.rst b/docs/doing-a-release.rst
index d790523..77582a4 100644
--- a/docs/doing-a-release.rst
+++ b/docs/doing-a-release.rst
@@ -18,7 +18,8 @@
----------------------
The commit which merged the version number bump is now the official release
-commit for this release. Once this has happened:
+commit for this release. You will need to have ``gpg`` installed and a ``gpg``
+key in order to do a release. Once this has happened:
* Run ``invoke release {version}``.