Conditional formatting. I have a cell that has the sum of two other cells.

[GN0001]

If the the total of two cells in M5 and M6 equals to the value of M10, then M10 should be filled in red. How can I manage this in conditional formatting?
Thanks,
GN

 

[iferror]

select cell M10 and then add conditional formatting to the cell
FORMULA IS
and type =((M5+M6)=M10)

 

[GN0001]

Thank you very much for your great help.
GN