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+Syncthing
+=========
+
+Synopsis
+--------
+
+::
+
+    syncthing [-audit] [-generate=<dir>] [-gui-address=<address>]
+              [-gui-apikey=<key>] [-gui-authentication=<username:password>]
+              [-home=<dir>] [-logflags=<flags>] [-no-browser] [-no-restart]
+              [-reset] [-upgrade] [-upgrade-check] [-upgrade-to=<url>]
+              [-verbose] [-version]
+
+Description
+-----------
+
+Syncthing is an application that lets you synchronize your files across multiple
+devices. This means the creation, modification or deletion of files on one
+machine will automatically be replicated to your other devices. We believe your
+data is your data alone and you deserve to choose where it is stored. Therefore
+Syncthing does not upload your data to the cloud but exchanges your data across
+your machines as soon as they are online at the same time.
+
+Options
+-------
+
+``-audit``
+    Write events to audit file.
+``-generate=<dir>``
+    Generate key and config in specified dir, then exit.
+``-gui-address=<address>``
+    Override GUI address.
+``-gui-apikey=<key>``
+    Override GUI API key.
+``-gui-authentication=<username:password>``
+    Override GUI authentication; username:password.
+``-home=<dir>``
+    Set configuration directory. The default configuration directory is:
+    ``$HOME/.config/syncthing``.
+``-logflags=<flags>``
+    Select information in log line prefix, default 2. The ``-logflags`` value is
+    a sum of the following:
+
+    -  1: Date
+    -  2: Time
+    -  4: Microsecond time
+    -  8: Long filename
+    - 16: Short filename
+
+    To prefix each log line with date and time, set ``-logflags=3`` (1 + 2 from
+    above). The value 0 is used to disable all of the above. The default is to
+    show time only (2).
+``-no-browser``
+    Do not start a browser.
+``-no-restart``
+    Do not restart; just exit.
+``-reset``
+    Reset the database.
+``-upgrade``
+    Perform upgrade.
+``-upgrade-check``
+    Check for available upgrade.
+``-upgrade-to=<url>``
+    Force upgrade directly from specified URL.
+``-verbose``
+    Print verbose log output.
+``-version``
+    Show version.
+
+Development Settings
+--------------------
+
+The following environment variables modify Syncthing's behavior in ways that
+are mostly useful for developers. Use with care.
+
+STGUIASSETS
+    Directory to load GUI assets from. Overrides compiled in assets.
+STTRACE
+    A comma separated string of facilities to trace. The valid facility strings
+    are:
+
+    - ``beacon``:   the beacon package
+    - ``discover``: the discover package
+    - ``events``:   the events package
+    - ``files``:    the files package
+    - ``http``:     the main package; HTTP requests
+    - ``locks``:    the sync package; trace long held locks
+    - ``net``:      the main package; connections & network messages
+    - ``model``:    the model package
+    - ``scanner``:  the scanner package
+    - ``stats``:    the stats package
+    - ``upnp``:     the upnp package
+    - ``xdr``:      the xdr package
+    - ``all``:      all of the above
+
+STPROFILER
+    Set to a listen address such as "127.0.0.1:9090" to start the profiler with
+    HTTP access.
+STCPUPROFILE
+    Write a CPU profile to cpu-$pid.pprof on exit.
+STHEAPPROFILE
+    Write heap profiles to heap-$pid-$timestamp.pprof each time heap usage
+    increases.
+STBLOCKPROFILE
+    Write block profiles to ``block-$pid-$timestamp.pprof`` every 20 seconds.
+STPERFSTATS
+    Write running performance statistics to perf-$pid.csv. Not supported on
+    Windows.
+STNOUPGRADE
+    Disable automatic upgrades.
+GOMAXPROCS
+    Set the maximum number of CPU cores to use. Defaults to all available CPU cores.
+GOGC
+    Percentage of heap growth at which to trigger GC. Default is 100. Lower
+    numbers keep peak memory usage down, at the price of CPU usage
+    (ie. performance).
+
+See also
+--------
+
+:manpage:`syncthing-config(5)`, :manpage:`syncthing-stignore(5)`,
+:manpage:`syncthing-device-ids(7)`, :manpage:`syncthing-security(7)`,
+:manpage:`syncthing-networking(7)`, :manpage:`syncthing-versioning(7)`,
+:manpage:`syncthing-faq(7)`