OnTriggerEnter2D not working

Hi I'm new to using Unity and tried doing collision the original code below is what I tired So then I tried to just put the col.isTrigger by itself in the if statement it doesn't show anything in the console log Help would be greatly appreciated.

 public class jabTrigger : MonoBehaviour {
     public int jabDamage = 10;

     void onTriggerEnter2D(Collider2D col)
     {
         if (col.isTrigger != true && col.CompareTag("Enemy"))
         {
             col.SendMessageUpwards("underAttack", jabDamage);
             Debug.Log("collision");
         }
     }

Enemy script

     void Update () {
           if (currHealth <= 0)
          {
                 Destroy(gameObject);
          }
    }
     public void underAttack(int damage)
     {
         currHealth -= damage;
         Debug.Log(currHealth);
        
     }
   

}