-When using GnuPG the additional use of the gpg-agent (@pxref{Caching
-passphrase}) is highly recommended, as it provides the most secure way
-for input and caching of passphrases. Please refer to the documentation
-of GnuPG for details on installation and usage.
+When using GnuPG, we recommend the use of the @code{gpg-agent}
+program, which is distributed with versions 2.0 and later of GnuPG.
+This is a daemon to manage private keys independently from any
+protocol, and provides the most secure way to input and cache your
+passphrases (@pxref{Caching passphrase}). By default, PGG will
+attempt to use @code{gpg-agent} if it is running. @xref{Invoking
+GPG-AGENT,,,gnupg,Using the GNU Privacy Guard}.
+
+PGG also supports Pretty Good Privacy version 2 or version 5.