Inspector showing DOCTYPE DTD in red even though I have it configured

I have the following html in my include.jsp, which I on every jsp page: IntelliJ's inspector is showing the "http://www.w3.org/TR/html4/loose.dtd" DTD in red with the message "URI is not registered (Settings | IDE Settings | Resources)." So I went to File->Settings->IDE Settings->]]>Resources to add the URI as an external resource. In there, under "Configure External Resources," I clicked on "Add..." and specified a URI of "http://www.w3.org/TR/html4/loose.dtd" and a Path of a path in my project of the loose.dtd document.

I still get that ugly red error! What do I do to satisfy IntelliJ?

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