+Supported options for **reindex** include
+
+ ``--decrypt=(true|false)``
+
+ If true, when encountering an encrypted message, try to
+ decrypt it while reindexing. If decryption is successful,
+ index the cleartext itself. Be aware that the index is likely
+ sufficient to reconstruct the cleartext of the message itself,
+ so please ensure that the notmuch message index is adequately
+ protected. DO NOT USE ``--decrypt=true`` without
+ considering the security of your index.
+
+ See also ``index.decrypt`` in **notmuch-config(1)**.
+