What does ##!PSA!## mean ?

Hi,

Plesk 12.5 latest Updates / Centos 6.8

Crons from a user stopped working.
I see in the file /var/spool/cron/userfile

MAILTO=""
##!PSA!## */1 * * * * /opt/plesk/php/5.6/bin/php -f 'path/to/skript'

what is ##!PSA!## ??

other files looks like
MAILTO=""
*/1 * * * * /opt/plesk/php/5.6/bin/php -f 'path/to/skript'