Marx’s manifesto is famous for summing up his theory of Communism with a single sentence: “Abolition of private property.” But this was hardly the only thing the philosopher believed must be abolished from bourgeois society in the proletariat's march to utopia. In his manifesto, Marx highlighted five additional ideas and institutions for eradication.
I think he's just lazy and just pulled up the Manifesto on marxists.org and did some CTRL+F