Watch Harry Styles Adorably Correct a Fan's Grammar on Concert Sign

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Harry Styles performs onstage during One Direction's "On the Road Again" tour opener at Qualcomm Stadium on July 9, 2015 in San Diego, California.  

Pro tip: If you're going to catch One Direction's attention in concert thanks to your awesome sign, please make sure the grammar is correct. Harry Styles begs you.

At the group's recent concert in Philadelphia, Styles spotted a sign that read "Hi Harry your so nice." Great message, but a little grammar error.

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Styles took matters into his own hands (literally), grabbing the sign, procuring a marker and fixing the sign so it read "you're."

The kind of role-model behavior that parents (and just anyone who appreciates good grammar) can get behind.