Comment the following code to help the reader:
```
def twoSumNaive(num_arr, pair_sum):
  for i in range(len(num_arr) - 1):
    for j in range(i + 1, len(num_arr)):
      if num_arr[i] + num_arr[j] == pair_sum:
        print("Pair with sum", pair_sum,"is: (", num_arr[i],",",num_arr[j],")")
```
      