[Fixed]-Add `help_text` to Django Admin field

Use a custom form if you don’t want change a model:

from django import forms

class MyForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super(MyForm, self).__init__(*args, **kwargs)
        self.fields['image'].help_text = 'My help text'

    class Meta:
        model = MyModel
        exclude = ()

@admin.register(MyModel)
class MyModelAdmin(admin.ModelAdmin):
    form = MyForm
    # ...

It took me a while to figure out. If you’ve defined a custom field in your admin.py only and the field is not in your model. Use a custom ModelForm:

class SomeModelForm(forms.ModelForm):
    # You don't need to define a custom form field or setup __init__()

    class Meta:
        model = SomeModel
        help_texts = {'avatar': "User's avatar Image"}
        exclude = ()

And in the admin.py:

class SomeModelAdmin(admin.ModelAdmin):
    form = SomeModelForm
    # ...

If you don’t want to create a custom model form class :

class MyModelAdmin(admin.ModelAdmin):
    def get_form(self, request, obj=None, change=False, **kwargs):
        form = super().get_form(request, obj=obj, change=change, **kwargs)
        form.base_fields["image"].help_text = "Some help text..."
        return form