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\section{Future Potential}  In the literature knowledge graphs are not (usually) distinguished from ``bare statement'' bare statement  graphs, in that they do not encode or publish the epistemology \footnote{Epistemology defines why something is known} of knowledge asserted in the graph. We see this as troubling because it does not {\em privilege} knowledge: in most existing knowledge graphs supported and unsupported assertions are given equal weight.  Moving forward, there is an opportunity to leverage existing vocabularies, including the Provenance Ontology (PROV-O) \cite{Moreau_2015}, and the Nanopublications Framework \cite{groth2010anatomy}, to improve the clarity and utility of knowledge graphs.  A nanopublication is a set of RDF graphs: an {\em assertion graph} (the knowledge), a {\em provenance graph} (the justification), and an {\em attribution graph} (the believer).