- set to true, notmuch will try to decrypt the message and index
- the cleartext. Be aware that the index is likely sufficient
- to reconstruct the cleartext of the message itself, so please
+ set to ``true``, notmuch will try to decrypt the message and
+ index the cleartext, stashing a copy of any discovered session
+ keys for the message. If ``auto``, it will try to index the
+ cleartext if a stashed session key is already known for the message
+ (e.g. from a previous copy), but will not try to access your
+ secret keys. Use ``false`` to avoid decrypting even when a
+ stashed session key is already present.
+
+ Be aware that the notmuch index is likely sufficient to
+ reconstruct the cleartext of the message itself, so please