+.. program:: reply
+
+.. option:: --duplicate=N
+
+ Reply to duplicate number N. The numbering starts from 1, and
+ matches the order used by :option:`show --duplicate` and
+ :option:`search --output=files <search --output>`.
+
+.. option:: --format=(default|json|sexp|headers-only)
+
+ default
+ Includes subject and quoted message body as an RFC 2822
+ message.
+
+ json
+ Produces JSON output containing headers for a reply message
+ and the contents of the original message. This output can be
+ used by a client to create a reply message intelligently.
+
+ sexp
+ Produces S-Expression output containing headers for a reply
+ message and the contents of the original message. This output
+ can be used by a client to create a reply message
+ intelligently.
+
+ headers-only
+ Only produces In-Reply-To, References, To, Cc, and Bcc
+ headers.
+
+.. option:: --format-version=N