Hi again, I'm using simplefonts (TeX Live 2013 version) and I have a main font: \setmainfont[Gentium Book Basic] and I can set a fallback for it, \setmainfontfallback[Gentium Plus][range={ipaextensions}, force=yes, rscale=auto] and that works. But then I have another font for the title: \definesimplefont[titleface][Gentium Basic][size=40pt] How do I set a fallback for it? After looking at the source code for simplefonts, I tried: % undefined cs: \definesimplefontfallback[titleface][Gentium Plus][range={ipaextensions}, force=yes, rscale=auto] % undefined cs: \fontfallback[titleface][Gentium Plus][range={ipaextensions}, force=yes, rscale=auto] % undefined cs: \definefallbackfont[titleface][Gentium Plus][range={ipaextensions}, force=yes, rscale=auto] But they all gave "undefined control sequence" errors. I can work around the problem by setting the main font before the title, using the main font for the title, and then changing the main font after the title is done. But that seems kludgy. Thanks, Lars