diff --git a/0-intro-shorter/slide.tex b/0-intro-shorter/slide.tex
index 7a39169..93cc560 100644
--- a/0-intro-shorter/slide.tex
+++ b/0-intro-shorter/slide.tex
@@ -1,3 +1,4 @@
+% !TEX program = XeLaTeX
 \documentclass{beamer}
 \usetheme[numbering=progressbar]{focus}
 \definecolor{main}{RGB}{47, 161, 219}