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diff --git a/macros/latex-dev/required/graphics/grfguide.tex b/macros/latex-dev/required/graphics/grfguide.tex
index 3b679ea382..585e87adc7 100644
--- a/macros/latex-dev/required/graphics/grfguide.tex
+++ b/macros/latex-dev/required/graphics/grfguide.tex
@@ -243,12 +243,27 @@ to the font commands such as |\textbf|:
So the above is essentially equivalent to
|{\color|\arg{name}\emph{text}|}|.
+\subsection{Using Colours in math formulas}
+
+While |\color| and to some extent |\textcolor| can be used in
+formulas, this is cumbersome, may lead to bad spacing, and in some
+situations is simply not possible. For this reason we also introduce
+|\mathcolor| which will help in this respect. The basic syntax is:
+
+\begin{decl}
+|\mathcolor|\arg{name}\arg{math}
+\end{decl}
+
+See \texttt{mathcolor.pdf} for details on this command.
+
+
\subsubsection{Using colour specifications directly}
\begin{decl}
|\color|\oarg{model}\arg{specification}\\
-|\textcolor|\oarg{model}\arg{specification}\arg{text}
+|\textcolor|\oarg{model}\arg{specification}\arg{text}\\
+|\mathcolor|\oarg{model}\arg{specification}\arg{math}
\end{decl}
Normally one would predeclare all the colours used in a package, or in