X-Debbugs-Cc: j...@w1.fi
Package: wpasupplicant
Version: 2:2.7-2
Severity: minor
File: /usr/share/man/man8/wpa_supplicant.8.gz

$ wpa_supplicant
usage:
  wpa_supplicant [-BddhKLqqstuvW] [-P<pid file>] [-g<global ctrl>] \
        [-G<group>] \
        -i<ifname> -c<config file> [-C<ctrl>] [-D<driver>] [-p<driver_param>] \
        [-b<br_ifname>] [-e<entropy file>] [-f<debug file>] \
        [-o<override driver>] [-O<override ctrl>] \
        [-N -i<ifname> -c<conf> [-C<ctrl>] [-D<driver>] \
        [-m<P2P Device config file>] \
        [-p<driver_param>] [-b<br_ifname>] [-I<config file>] ...]


So please change the man page:
<wpa_supplicant [ -BddfhKLqqsTtuvW ] [ -iifname ] [ -cconfig file ] [ -Ddriver 
] [ -PPID_file ] [ -foutput file ]
>wpa_supplicant [ -BddfhKLqqsTtuvW ]   -iifname     -cconfig file   [ -Ddriver 
>] [ -PPID_file ] [ -foutput file ]

Because -c and -i are not "optional" but required.
By the way you say -PPID_file so say -cconfig_file not -cconfig file.
Also e.g., -c config_file looks smarter than -cconfig_file and works
too! So maybe add that space after all of them.

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