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I introduce the exact relation between the displacement current $\epsilon_0\partial \v{E}/\partial t$ and the ordinary current $\v{J}$. I show that$\epsilon_0 \partial \v{E}/\partial t$ contains a local term determined by thepresent values of $\v{J}$ plus a non-local term determined by the retardedvalues of $\v{J}$. The non-local term implements quantitatively the suggestionmade by Griffiths and Heald that the displacement current at a point is asurrogate for ordinary currents at other locations.

The exact relation between the displacement current and the conduction current: Comment on a paper by Griffiths and Heald