Added an acknowledgment.

comparable-box-dimension.tex

@@ -159,8 +159,11 @@ a box obtained from $f(v)$ by scaling it by a factor of three, and thus $1+|N(v)
 
 \section{Exploiting the product structure}
 
-\bibliographystyle{siam}
+\subsection*{Acknowledgments}
+This research was carried out at the workshop on Geometric Graphs and Hypergraphs organized by Yelena Yuditsky and Torsten Ueckerdt
+in September 2021.  We would like to thank the organizers and all participants for creating a friendly and productive environment.
 
+\bibliographystyle{siam}
 \bibliography{data}
 
 \end{document}