Document spotty engine support

latex3 · May 23, 2022 · d54dbb7 · d54dbb7
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diff --git a/fontspec-doc-featset.tex b/fontspec-doc-featset.tex
@@ -615,6 +615,8 @@ \section{Variable fonts} \label{sec:variable}
 orthogonal font axes, allowing continuous selection along such features
 as weight, width, and optical size.
 
+Currently OpenType variable fonts are only supported in \LuaTeX, while
+Multiple Master fonts only work with \XeTeX.
 
 \subsection{Optical font sizes} \label{sec:aat-opticalsize}
 Whereas traditional OpenType fonts will have only a few separate