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-rw-r--r--macros/optex/doc/optex-math.tex9
1 files changed, 6 insertions, 3 deletions
diff --git a/macros/optex/doc/optex-math.tex b/macros/optex/doc/optex-math.tex
index 5f590d5b25..4c9d5dd01f 100644
--- a/macros/optex/doc/optex-math.tex
+++ b/macros/optex/doc/optex-math.tex
@@ -859,9 +859,12 @@ stretchability in the `\>` space, and more stretchability in the `\;` space.
The registers \x`\thinmuskip`, \x`\medmuskip`, and \x`\thickmuskip` store so-called
\ii mu/values {\em mu values} given by math unit `mu`. It is 1/18 em and this unit depends
on the current font size used in the math formula ($S$ or $SS$ styles use
-smaller font size, the `mu` unit is smaller here). You can use \x`\muskip`
-instead `\hskip` or \x`\mukern` instead `\kern` if you want to use this
-special mu unit. It is allowed only in math mode.
+smaller font size, the `mu` unit is smaller here). You can use \x`\mskip`
+instead `\hskip` or \x`\mkern` instead `\kern` if you want to use this
+special `mu` unit. It is allowed only in math mode.
+
+If \x`\nonscript` precedes `\hskip`, `\mskip`, `\kern`, or `\mkern` then this
+space is applied only in $D$ or $T$ style.
The \x`\quad` and \x`\qquad` spaces have fixed width and they can be used in text
mode too. (\OpTeX/ allows to use `\,` in text mode too).