-# Is a GPG key ID. This key ID is validated with a regex enforcing it
-# to only contain valid hexadecimal characters, be precisely 8 or 16
-# characters long and optionally prefixed with 0x.
+# Is a GPG key ID or full key fingerprint. This value is validated with
+# a regex enforcing it to only contain valid hexadecimal characters, be
+# precisely 8 or 16 hexadecimal characters long and optionally prefixed
+# with 0x for key IDs, or 40 hexadecimal characters long for key
+# fingerprints.