Marking cloth with chalk

[riding9]

I was watching the Dennis Orcullo doubles match the over day and I noticed that every so often some would mark the the cloth around object balls. What's the reason for this?

 

[garczar]

I was watching the Dennis Orcullo doubles match the over day and I noticed that every so often some would mark the the cloth around object balls. What's the reason for this?

In case they get bumped and have to go back.