I don't like adding up more isms as more authors add their knowledge to it, like after Mao added his contributions, then some people started calling it afterwards Marxism-Leninism-Maoism... Marxism is a broad field of science that encompasses economics, history, sociology, revolutionary organization etc...

That said, I love Mao and Lenin's additions to the theory. But for simplicity, I just call the field of study as Marxism.