diff --git a/extra/math/derivatives/derivatives-docs.factor b/extra/math/derivatives/derivatives-docs.factor
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+USING: help.markup help.syntax ;
+
+IN: math.derivatives
+
+HELP: derivative ( x function -- m )
+{ $values { "x" "the x-position on the function" } { "function" "a differentiable function" } }
+{ $description "Finds the slope of the tangent line at the given x-position on the given function." } ;
+
+{ derivative-func } related-words