Not expecting void Start

Hi, I'm trying to make a very basic melee attack, but when I tried adding a cooldown to the attack, I got the error "...(10.12):error CS1519: Unexpected symbol 'void' in class, struct, or interface member declaration" My problem is that the error is refereeing to the "void Start" in the initialization, w$$anonymous$$ch has to be there, what did I do wrong? Here's the code, thanks a bunch.

 using UnityEngine;
 using System.Collections;
 
 public class PlayerAttack : MonoBehaviour {
     public GameObject target;
     public float attackTimer;
     public float coolDown
 
     // Use t$$anonymous$$s for initialization
     void Start () {
         attackTimer = 0;
         coolDown = 2.0f;
     }
     
     // Update is called once per frame
     void Update () {
         if(attackTimer > 0)
             attackTimer -= Time.fixedDeltaTime;
         
         if(attackTimer < 0)
             attackTimer = 0;
         
         if(Input.GetKeyUp(KeyCode.F)) {
             if(attackTimer ==0){
                 Attack();
                 attackTimer = coolDown;
             }
         }
         
     }
     
     private void Attack() {
         float distance = Vector3.Distance(target.transform.position, transform.position);
         
         Vector3 dir = (target.transform.position - transform.position).normalized;
             
         float direction = Vector3.Dot(dir, transform.forward);
         
         Debug.Log(direction);
         
         if(distance < 2.5f) {
             if(direction > 0) {
             EnemyHealth eh = (EnemyHealth)target.GetComponent("EnemyHealth");
             eh.AddjustCurrentHealth(-10);
             }
         }
     }
 }