play "fall" animation when player is falling

Hello good am/pm! I am making a 3rd person 3d game and i am having trouble on my boolean falling animation because I want my “Falling” animation to play when the player is falling but its not working but i tried to search to look some answer and some adjustment with my script but still had no luck. Here is some of a part of my script and all answers will be appreciated. Thanks!`

       if (controller.isGrounded);
       {
           mAnimator.SetBool("Falling", false);
       }

       if (!controller.isGrounded);
       {
           mAnimator.SetBool("Falling", true);

       }

Are you getting any errors? Please provide more information about your issue.