When you first enter your hotel room, what do you usually see? A door sign hanger welcoming you to your room or perhaps a piece of chocolate on your pillow? What about an envelope to leave a tip for your housekeeper?

It might sound strange, but if you're staying at a Marriott property in the next couple of days, you might be in luck.

Marriott has partnered with A Woman's Nation (AWN) to start an initiative called "The Envelope Please" that will allow guests to leave a tip for the room attendant who will be cleaning their room.

"Our caring room attendants enjoyed making your stay warm and comfortable. Please feel free to leave a gratuity to express your appreciation for their effort," the envelope reads.

A Woman's Nation was founded by Maria Shriver to raise awareness and encourage change in the modern woman and her family.

"The Envelope Please was born from having conversations with women I've met who have taken care of my room during hotel stays," Shriver said in a news release. "Their stories of hard work and perseverance inspired and informed me. They told me that room attendants, who are often the primary breadwinner for their families, are often forgotten when it comes to tipping, unlike other front-of-house employees, since most travelers don't see them face-to-face. I hope this gratitude initiative will make these women feel seen and validated."

Envelopes will be placed in 160,000 rooms in both the United States and Canada. Marriott brands such as Courtyard, Residence Inn, J.W. Marriott, Ritz-Carlton and Renaissance hotels will be participating.

"In a hotel, obviously we tip the bellman or wait staff. But we don’t see our housekeepers," said Arne Sorenson, chief executive of Marriott.

The American Hotel and Lodging Association (AH&LA) recommends that you should tip housekeepers and housemen $1-5 per night. For special request such as an extra blanket, you should tip $4 for one item, $1 for more.

Michael Lynn, a professor at Cornell University's School of Hotel Administration, says his research shows that "30 percent of people stiff the maid," while 70 percent said they usually leave a tip.

Housekeepers make up more than 20,000 positions in the United States and Canada for Marriott. They are usually paid by the hour, and schedules vary throughout the year based on hotel occupancy levels.

According to the U.S. Bureau of Labor Statistics in 2012, maids and housekeepers earned a median salary of $19,780, which is about $9.51 per hour.

"Room attendants are one of the largest employment categories in the hotel industry, and their work behind the scenes is so important to the quality of the stay in any hotel," says Katherine Lugar, president and CEO of AH&LA. "The Envelope Please is an effective way for guests to recognize their room attendant's work and show appreciation for making every stay a memorable and pleasant experience."