Put it on a poster:

"It's ok to:

say "I don't know"
ask for more clarity
stay at home when you feel ill
say you don't understand
ask what acronyms stand for
ask why, and why not
forget things
introduce yourself
depend on the team
ask for help
not know everything
have quiet days
have loud days,
to talk,
joke and laugh
put your headphones on
say "No" when you're too busy
make mistakes
sing
sigh
not check your email out of hours
not check your email constantly during hours
just Slack it
walk over and ask someone face-to-face
go somewhere else to concentrate
offer feedback on other people's work
challenge things you're not comfortable with
say yes when anyone does a coffee run
prefer tea
snack
have a messy desk
have a tidy desk
work how you like to work
ask the management to fix it
have off-days
have days off

(From UK Government Digital Service: https://gds.blog.gov.uk/2016/05/...)