Adding targets to an array

So I'm following the Bergzerg tutorials and I'm having a bit of an issue. For the life of me I cannot see what is missing. I have all my enemies tagged as Enemy and have the following code to find them but they are not adding to my targets.

Code (csharp):

1.  
2. using UnityEngine;
3. using System.Collections;
4. using System.Collections.Generic;
5.  
6. public class Targeting : MonoBehaviour {
7.    
8.     public List<Transform> targets;
9.    
10.     // Use this for initialization
11.     void Start () {
12.         targets = new List<Transform>();
13.     }
14.     //Add enemies to array
15.     public void AddAllEnemies(){
16.         GameObject[] go = GameObject.FindGameObjectsWithTag("Enemy");
17.        
18.         foreach(GameObject enemy in go)
19.             AddTarget(enemy.transform );
20.     }
21.     // Add enemies to player target
22.     public void AddTarget(Transform enemy){
23.         targets.Add(enemy);
24.     }
25.    
26.     // Update is called once per frame
27.     void Update () {
28.    
29.     }
30. }
31.  

 

Got my answer on the unity answers page. I'm not calling the AddAllEnemies method in my start method