- With no search terms, a dump of all messages in the database will be
- generated. A "--" argument instructs notmuch that the remaining
- arguments are search terms.
+``--include=(config|properties|tags)``
+ Control what kind of metadata is included in the output.
+
+ **config**
+ Output configuration data stored in the database. Each line
+ starts with "#@ ", followed by a space separated key-value
+ pair. Both key and value are hex encoded if needed.
+
+ **properties**
+ Output per-message (key,value) metadata. Each line starts
+ with "#= ", followed by a message id, and a space separated
+ list of key=value pairs. Ids, keys and values are hex encoded
+ if needed. See **notmuch-properties(7)** for more details.
+
+ **tags**
+ Output per-message boolean metadata, namely tags. See *format* above
+ for description of the output.
+
+ The default is to include all available types of data. The option
+ can be specified multiple times to select some subset. As of
+ version 3 of the dump format, there is a header line of the
+ following form::
+
+ #notmuch-dump <*format*>:<*version*> <*included*>
+
+ where <*included*> is a comma separated list of the above options.