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-rw-r--r--doc/emacs/package.texi6
1 files changed, 5 insertions, 1 deletions
diff --git a/doc/emacs/package.texi b/doc/emacs/package.texi
index 1c0f8534275..b9eb0a5852d 100644
--- a/doc/emacs/package.texi
+++ b/doc/emacs/package.texi
@@ -258,7 +258,11 @@ option has the value @code{allow-unsigned}, and a usable OpenPGP
configuration is found, signed packages will be checked, but you can
still install a package that is not signed. If you use some archives
that do not sign their packages, you can add them to the list
-@code{package-unsigned-archives}.
+@code{package-unsigned-archives}. (If the value is
+@code{allow-unsigned} and no usable OpenPGP is found, this option is
+treated as if its value was @code{nil}.) If the value is @code{t}, at
+least one signature must be valid; if the value is @code{all}, all of
+them must be valid.
For more information on cryptographic keys and signing,
@pxref{Top,, GnuPG, gnupg, The GNU Privacy Guard Manual}.