The union representing thousands of housekeepers in Las Vegas on Wednesday said Caesars Entertainment has rejected a proposal to include language in a new contract that would protect workers if a “Do Not Disturb” sign has been hanging on a doorknob for more than 24 hours.

The Chinese resort enclave posted monthly gaming revenue of $3.2 billion compared with $2.5 billion in the same month last year. It was the 21st consecutive month of growth.