diff --git a/README.md b/README.md
index 37df891..6d08165 100644
--- a/README.md
+++ b/README.md
@@ -110,6 +110,17 @@ The output directory will contain all the generated PDF files and the PDF file c
 
 **Note**: In case the rendering is somewhat broken, it might be related to latex using the styles installed systemwide in `/usr/share/texlive/texmf-dist/tex/latex/beamertheme-focus`. Removing this directory will solve the problem.
 
+## Dependencies
+
+[FiraMath Font](https://github.com/firamath/firamath/releases)
+
+XeLaTex, can be parametered in .tex header (works in TeXshop):
+
+```
+% !TEX TS-program = xelatex
+% !TEX encoding = UTF-8 Unicode
+```
+
 ## License, Attribution and Funding
 
 All the materials are dual-licensed under GNU Affero General Public License version 3 or later and
diff --git a/x.11-gsma/slide.tex b/x.11-gsma/slide.tex
index 7a39169..9339a3f 100644
--- a/x.11-gsma/slide.tex
+++ b/x.11-gsma/slide.tex
@@ -1,3 +1,5 @@
+% !TEX TS-program = xelatex
+% !TEX encoding = UTF-8 Unicode
 \documentclass{beamer}
 \usetheme[numbering=progressbar]{focus}
 \definecolor{main}{RGB}{47, 161, 219}