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diff --git a/doc/gpg.texi b/doc/gpg.texi
index 420326b5d..d8e4bcdef 100644
--- a/doc/gpg.texi
+++ b/doc/gpg.texi
@@ -2637,6 +2637,20 @@ Disable all checks on the form of the user ID while generating a new
one. This option should only be used in very special environments as
it does not ensure the de-facto standard format of user IDs.
+@ifset gpgtwoone
+@item --allow-v3-keys
+@itemx --no-allow-v3-keys
+@opindex allow-v3-keys
+Allow the use of deprecated v3 keys with @command{gpg}. The default
+is not to allow their use.
+
+Since version 2.1 GnuPG does not anymore allow the import or use of v3
+keys. Those keys have been generated in the past by PGP 2 and exhibit
+a couple of flaws. For example they rely on the broken MD5 algorithm.
+OpenPGP has long deprecated their use (cf. RFC-4880, section 5.5.2).
+This option may be used to exceptionally allow their use.
+@end ifset
+
@item --ignore-time-conflict
@opindex ignore-time-conflict
GnuPG normally checks that the timestamps associated with keys and