A tip shared by a California police department in 2015 is still relevant for parents before taking a child to a large, crowded place.

"Write your phone number on their wrist and cover it with liquid band-aid in case you get separated," the Clovis Police Department wrote on Facebook

Covering the ink with the liquid band-aid will keep it from washing off.

>> Read more trending stories

"Also, take a photo of them using your cell phone the morning of the event so you have their clothing, hair style, and up to date photo," the post continued.

The department first posted the tip in September 2015 before a large event in the city. The post was so popular the department decided to share it again.