I updated my Help function but i keep receiving a NameError for "add_to_list" not being defined. but it's defined twice

shopping_list = []

def show_help():
  print("What should we pick up at the store?")
  print(""" 
  Enter 'DONE' to stop adding iems.
  Enter 'HELP' for this help.
  Enter 'SHOW to see your current list.
  """)


  def add_to_list(item):
    shopping_list.append(item)
    print("Added! List has {} items.".format(len(shopping_list)))

  #Define a function name show_list that prints all the items in the list
  def show_list():
    print("Heres your list:")
    for item in shopping_list:
      print(item)

show_help()
while True:
  new_item = input("> ")
  if new_item == 'DONE':
     break
  elif new_item == 'HELP':
      show_help() 

  elif new_item == 'SHOW':
      show_list()
      continue


  add_to_list(new_item)



show_list()