openpgp: Clarify validity periods of zero.

parent 8ef8eafb
......@@ -911,7 +911,9 @@ impl SubpacketArea {
/// which contains when the signature expires as the number of
/// seconds after its creation.
///
/// If the subpacket is not present, this returns `None`.
/// If the subpacket is not present, this returns `None`. If this
/// function returns `None`, or the returned period is `0`, the
/// signature does not expire.
///
/// Note: if the signature contains multiple instances of this
/// subpacket, only the last one is considered.
......@@ -1041,7 +1043,9 @@ impl SubpacketArea {
/// contains when the referenced key expires as the number of
/// seconds after the key's creation.
///
/// If the subpacket is not present, this returns `None`.
/// If the subpacket is not present, this returns `None`. If this
/// function returns `None`, or the returned period is `0`, the
/// key does not expire.
///
/// Note: if the signature contains multiple instances of this
/// subpacket, only the last one is considered.
......
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