How to change the label for username to 'username/email' in login page in Django

I am building a car rental website with Django. Currently working on user authentication.The user can either use his/her username/email and password to login.It's working fine. My question is, how will I change the label for username field to "username/email" so that the user can understand that either username or email can be entered. I cannot  make changes in the login.html template because I have used there {{ form.as_p }} tag and the concerned portion in my forms.py file has:

    class LoginForm(forms.Form):

        username = forms.CharField()

        password = forms.CharField(widget=forms.PasswordInput)

I am not able to understand where to make changes. Please help.

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