Scientists at the University of Georgia have discovered the secret to a long and happy marriage. They surveyed 468 married people and asked questions about finance, communication and expressions of gratitude by their spouses.

“We found that feeling appreciated and believing that your spouse values you directly influences how you feel about your marriage, how committed you are to it, and your belief that it will last,” said Ted Futris, co-author of the study.

They also found that spousal gratitude can solve negative problems in other areas of the relationship as well, such a money problems or arguments.

The most consistent significant predictor of marital quality in the study turned out to be spousal expression of gratitude, that is saying thank you. “It goes to show the power of ‘thank you,’” Allen Barton, lead author, said. “Even if a couple is experiencing distress and difficulty in other areas, gratitude in the relationship can help promote positive marital outcomes.”

The secret of a long and happy marriage? Thank your spouse at every opportunity.