diff --git a/thesisStructure.tex b/thesisStructure.tex
index e9908d7..53d4d96 100644
--- a/thesisStructure.tex
+++ b/thesisStructure.tex
@@ -1,4 +1,5 @@
 % Engineering, master and phd degree thesis format, September 2020, for the "Instituto Tecnológico de Morelia"
+\documentclass[listings,drafting,spanish]{itmthesis} %itm thesis class definition
 \input{configuration}% configuration & packages required
 \begin{document}
 \pagenumbering{roman} % Roman page numbering