diff --git a/assets/manual/tex/signals.tex b/assets/manual/tex/signals.tex
index 53da702..28225f1 100644
--- a/assets/manual/tex/signals.tex
+++ b/assets/manual/tex/signals.tex
@@ -118,7 +118,7 @@ In this case, the train proceeds in shunt mode.
 \end{apidoc}
 
 \subsubsection{Differences from real-life signals}
-The signal book at \url{https://www.bahnstatistik.de/Signale_pdf/SB-DBAG.pdf} is used for reference. This list is not comprehensive.
+The signal book at \url{https://www.bahnstatistik.de/Signalbuecher/SB-DBAG_2006.pdf} is used for reference. This list is not comprehensive.
 \begin{itemize}
 \item The speed is indicated in m/s instead of multiples of 10km/h.
 \item Certain visual effects, such as making signal signs reflective or lit at night, are not implemented.