diff --git a/main.tex b/main.tex
index 60a5a3c..95e63e8 100644
--- a/main.tex
+++ b/main.tex
@@ -28,6 +28,7 @@
 \usepackage{tabularx}                       % Tables with automatic column width adjustment
 \usepackage{tikz}                           % Drawing diagrams and illustrations
 \usepackage{tikz-qtree}                     % Easy syntax for trees with TikZ
+\usepackage{xparse}                         % Easy modern commands
 
 % Languages
 \usepackage[english]{babel}