diff --git a/doc/tutorial/tutorial.pdf b/doc/tutorial/tutorial.pdf
index 1b22467..f8cab1f 100644
Binary files a/doc/tutorial/tutorial.pdf and b/doc/tutorial/tutorial.pdf differ
diff --git a/doc/tutorial/tutorial.tex b/doc/tutorial/tutorial.tex
index 9efc799..1e6959e 100644
--- a/doc/tutorial/tutorial.tex
+++ b/doc/tutorial/tutorial.tex
@@ -128,4 +128,12 @@ $> run
 \end{lstlisting}
 \end{small}
 
+
+\newpage
+\section{References}
+\begin{itemize}
+\item http://www.st.com/internet/mcu/product/248823.jsp\\
+  all the documentation related to STM32L discovery kit
+\end{itemize}
+
 \end{document}