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# How to add a comment to gpg keys
Add it manually, the supported options include (RFC4880):
- "Version", which states the OpenPGP implementation and version
used to encode the message.
- "Comment", a user-defined comment. OpenPGP defines all text to
be in UTF-8. A comment may be any UTF-8 string. However, the
whole point of armoring is to provide seven-bit-clean data.
Consequently, if a comment has characters that are outside the
US-ASCII range of UTF, they may very well not survive transport.
- "MessageID", a 32-character string of printable characters. The
string must be the same for all parts of a multi-part message
that uses the "PART X" Armor Header. MessageID strings should be
unique enough that the recipient of the mail can associate all
the parts of a message with each other. A good checksum or
cryptographic hash function is sufficient.
The MessageID SHOULD NOT appear unless it is in a multi-part
message. If it appears at all, it MUST be computed from the
finished (encrypted, signed, etc.) message in a deterministic
fashion, rather than contain a purely random value. This is to
allow the legitimate recipient to determine that the MessageID
cannot serve as a covert means of leaking cryptographic key
information.
- "Hash", a comma-separated list of hash algorithms used in this
message. This is used only in cleartext signed messages.
- "Charset", a description of the character set that the plaintext
is in. Please note that OpenPGP defines text to be in UTF-8. An
implementation will get best results by translating into and out
of UTF-8. However, there are many instances where this is easier
said than done. Also, there are communities of users who have no
need for UTF-8 because they are all happy with a character set
like ISO Latin-5 or a Japanese character set. In such instances,
an implementation MAY override the UTF-8 default by using this
header key. An implementation MAY implement this key and any
translations it cares to; an implementation MAY ignore it and
assume all text is UTF-8.
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