Limit rotation

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class rotate : MonoBehaviour {

    public float rotSpeed = 2;
    public float rotRange = 90;
    public float currentRot;


    void Update ()
    {
        //Input for rotation
        float rotDir = Input.GetAxis("Horizontal") *rotSpeed;
        currentRot = currentRot +rotDir;

        // Limitation with clamp
        currentRot = Mathf.Clamp(currentRot, -rotRange, rotRange);

        //rotate dat thing
        if(currentRot < rotRange && currentRot > -rotRange)
        transform.Rotate(transform.forward, +rotDir);
	}
}