When doing migrations in django models it was giving this the prompt ! can any one help me ?

C:\Users\HP\OneDrive\Desktop\personal_portfolio>python manage.py makemigrations
It is impossible to add a non-nullable field 'description' to project_blog without specifying a default. This is because the database needs something to populate existing rows.
Please select a fix:
 1) Provide a one-off default now (will be set on all existing rows with a null value for this column)
 2) Quit and manually define a default value in models.py.
Select an option:

C:\Users\HP\OneDrive\Desktop\personal_portfolio>python manage.py makemigrations
It is impossible to add a non-nullable field 'description' to project_blog without specifying a default. This is because the database needs something to populate existing rows.
Please select a fix:
 1) Provide a one-off default now (will be set on all existing rows with a null value for this column)
 2) Quit and manually define a default value in models.py.
Select an option: