diff --git a/slides_template/Makefile b/slides_template/Makefile
index 13364cf..0d15514 100644
--- a/slides_template/Makefile
+++ b/slides_template/Makefile
@@ -4,7 +4,7 @@ all: notes.config vc $(patsubst %.tex,%.pdf,$(wildcard *.tex))
 pdf: all
 
 %.pdf: %.tex
-	latexmk -f -xelatex $<
+	latexmk -f -lualatex $<
 	# latexmk -f -pdf -pdflatex="xelatex -synctex=1 %S %O" -verbose -file-line-error -interaction=nonstopmode $<
 	# qpdf --qdf --object-streams=disable $@ - | sponge $@
 	# sed -e 's|/PageLabels|/BageLapels|g' < $@ |sponge $@
diff --git a/slides_template/example.tex b/slides_template/example.tex
index 41a4c27..04b16a7 100644
--- a/slides_template/example.tex
+++ b/slides_template/example.tex
@@ -1,8 +1,15 @@
+\DocumentMetadata{
+  pdfversion=2.0,
+  lang=en-US,
+}
 \documentclass[10pt,xcolor=dvipsnames,aspectratio=169]{beamer}
 
 \usetheme{metropolis}
 \usepackage{appendixnumberbeamer}
 
+\usepackage{tagpdf}
+\tagpdfsetup{activate-all}
+
 \usepackage{pgfpages}
 \input{notes.config}
 
@@ -109,10 +116,10 @@ BoldItalicFont  =   *-BoldItalic
 \tikzstyle{every picture}+=[overlay,remember picture]
 
 % add functions to circle parts of slides (e.g., in tables)
-\newcommand\marktopleft[1]{\tikz \node (marker-#1-a) at (0,1.5ex) {};}
+\newcommand\marktopleft[1]{\tagmcbegin{artifact}\tikz \node (marker-#1-a) at (0,1.5ex) {};\tagmcend}
 \newcommand\markbottomright[1]{%
-  \tikz{\node (marker-#1-b) at (0,0) {};}
-  \tikz[dashed,inner sep=3pt]{\node[violet!75,ultra thick,draw,rounded rectangle,fit=(marker-#1-a.center) (marker-#1-b.center)] {};}}
+  \tagmcbegin{artifact}\tikz{\node (marker-#1-b) at (0,0) {};}\tagmcend
+  \tagmcbegin{artifact}\tikz[dashed,inner sep=3pt]{\node[violet!75,ultra thick,draw,rounded rectangle,fit=(marker-#1-a.center) (marker-#1-b.center)] {};}\tagmcend}
 
 % create an empty quotetxt so we can reuse it
 \newcommand{\quotetxt}{}
@@ -153,7 +160,7 @@ BoldItalicFont  =   *-BoldItalic
 \newcommand{\credit}[1]{%
   \tikz[overlay]{\node at (current page.south west)
     [anchor=south west, yshift=3pt, xshift=2pt]
-    {\smaller \smaller {[}#1{]}};}}
+    {\tagmcbegin{artifact}\smaller \smaller {[}#1{]}\tagmcend};}}
 
 \setlength{\parsep}{1em}