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--- a/macros/luatex/latex/pyluatex/README.md
+++ b/macros/luatex/latex/pyluatex/README.md
@@ -7,6 +7,11 @@ LaTeX documents must be compiled with LuaLaTeX for this to work.
## Example
1\. LaTeX document `example.tex`
+
+**Note:** PyLuaTeX starts Python 3 using the command `python3` by default.
+If `python3` does not start Python 3 on your system, find the correct command
+and replace `\usepackage{pyluatex}` with `\usepackage[executable={your python command}]{pyluatex}`.
+For example, `\usepackage[executable=python.exe]{pyluatex}`.
```latex
\documentclass{article}
@@ -31,6 +36,7 @@ $\sqrt{371} = \py{math.sqrt(371)}$
\randint{2}{5}
\end{document}
```
+
2\. Compile using LuaLaTeX (shell escape is required)
```
lualatex -shell-escape example.tex