How to find the monotone decreasing interval of function y = | x + 3 |? RT. better be more detailed

How to find the monotone decreasing interval of function y = | x + 3 |? RT. better be more detailed

When x + 3 > = 0, that is, x > = - 3, then the function is y = x + 3, monotone increasing function; when x + 3 > = 0, that is, x > = - 3, then the function is y = x + 3, monotone increasing function