McDonald's is replacing the traditional toy in its Happy Meals in February with Valentine’s Day themed books.

One of four books will be available in the meals.

McDonald's started replacing toys with books in their Happy Meals in 2014. By the end of this year the fast food chain hopes to distribute 50 million books, according to a statement by McDonald's.

“Ensuring children have access to books has proven instrumental in combating illiteracy in children in the United States,” Carol H. Rasco, president and CEO of Reading is Fundamental said in a statement.