That is a generic message that means they changed "something" on your return. When you receive your refund there will be a more specific letter a few weeks later. Quite often it has to do with an incorrect answer pertaining to the recovery rebate credit, but it could be for something else.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
