Hi, I just added an explanation of "fullhz" to the options in https://wiki.contextgarden.net/Command/setupalign. but I’m actually unsure if it’s right. In the sources I found: https://source.contextgarden.net/tex/context/base/mkxl/hand-ini.mkxl %D At some point we can introduce extreme expansion, i.e. \type {\normaladjustspacing\plustwo}. 56 57% 0 = disabled 58% 1 = notused (thesis) 59% 2 = glyph + kern 60% 3 = glyph only (default) 61 62\def\font_expansion_enable {\normaladjustspacing\plusthree} 63\def\font_expansion_enable_k{\normaladjustspacing\plustwo} 64%def\font_expansion_enable_n{\normaladjustspacing\plusone} 65\def\font_expansion_disable {\normaladjustspacing\zerocount} And "fullhz" in spac-ali.mkxl calls \font_expansion_enable_k. So, apparently fullhz enables stretching of *kerning* – that sounds to me like letterspacing. OTOH in my notes (and thus in my book) I have the information that fullhz enables stretching of *glue*, and I thought that would mean whitespace outside of words. Please enlighten me? Hraban