Originally Posted by hockeyinsider

​Here is the actual language from the terms and conditions:

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"Complimentary Room Upgrade: Upgrades are based on room availability at check-in and limited to a member's personal guestroom. Upgrades may include rooms with desirable views, rooms on high floors, corner rooms, rooms with special amenities and rooms on Executive Floors. Suites are included for Platinum members only. Rooms with direct Club Lounge access are excluded. All upgrades are granted on a space-available basis, as determined at the time of check-in. Upgrades are subject to availability and identified by each hotel."

https://www.marriott.com/rewards/terms/elite.mi