diff --git a/introduction.tex b/introduction.tex
index efb3eb6..89a774c 100644
--- a/introduction.tex
+++ b/introduction.tex
@@ -3,5 +3,10 @@
 
 This is the introduction.
 
+
 \section{Contributions}
-\label{sec:}
+\label{sec:contr}
+
+
+\section{Structure}
+\label{sec:struct}