diff --git a/report.tex b/report.tex
index d31fc3c..3fd9fe9 100644
--- a/report.tex
+++ b/report.tex
@@ -1,6 +1,8 @@
 \documentclass[english,titlepage,nomath,nopackage,oneside]{siltex-book}
 \include{include/preamble}
 
+\newcommand{\ridm}{\ac{ridm} }
+
 \title{Title}
 \subtitle{Thesis Report}
 \course{}