Puzzle No 131: Only1Diagonal Sudoku

Rules:

Place numbers in the grid such that each row, column, and 3*3 box contain the numbers 1-9. Additionally, one of the main diagonals (Top Left to Bottom Right or Bottom Left to Top Right) also contains numbers 1-9. It's part of solving to figure out which diagonal.

Theme: Diagonally Symmetric

Difficulty: Medium

Puzzle: