Small updates to paper and notebook

doc/paper/rotohsm_paper.tex

@@ -485,6 +485,8 @@ which allows us to reliably transfer several tens of bytes in each direction dur
 speed of rotation. As a result of our prototype experiments, we consider a larger-scale implementation of the inertial
 HSM concept practical.
 
+\section{Using accelerometers as rotation sensors}
+
 \begin{figure}
     \center
     \includegraphics[width=8cm]{prototype_early_comms_small.jpg}