Where are the Women artists?

Art For the Tate, Jemima Kirke who plays Jessa Johansson in HBO's Girls, presents this short history of women artists and their marginalisation in the history of art. I'm not sure what the answer is to redressing the balance, but certainly the BBC could make a start with a documentary series laying out the whole history of women artists in context, not unlike the section on Judith Leyster here.