== SYNOPSIS
-i3 [-a] [-c configfile] [-C] [-d <loglevel>] [-v] [-V]
+i3 [-a] [-c configfile] [-C] [-d all] [-v] [-V]
== OPTIONS
-C::
Check the configuration file for validity and exit.
--d::
-Specifies the debug loglevel. To see the most output, use -d all.
+-d all::
+Enables debug logging.
+The 'all' parameter is present for historical reasons.
-v::
Display version number (and date of the last commit).