add link to Joachim in Preface and thank reviewers

LMSN/P0-Preface.tex

@@ -93,7 +93,10 @@ \section*{Past, present, and future}
 In the summer of 2021, we taught a course on a draft of this book that was livestreamed from the Topos Institute.
 Lecture recordings are freely available at \url{https://topos.site/poly-course/}.
 
-The theory and application of polynomial functors comprise an active area of research.
+The theory and application of polynomial functors comprise an active area of research. An excellent reference is Joachim Kock's notes
+\begin{center}
+\url{https://mat.uab.cat/~kock/cat/polynomial.pdf}.
+\end{center}
 We have laid the foundations here, but work is still ongoing.
 Even as we were writing this, we were discovering new results and uses for polynomial functors, which only goes to show how bountiful $\poly$ can be in its rewards---but of course, we had to cut things off somewhere.
 We say this in the hope that you will keep the following in mind: where this book ends, the story will have just begun.
@@ -104,6 +107,8 @@ \section*{Acknowledgments}
 
 Thanks go to John Baez, Eric Bond, Spencer Breiner, Kris Brown, Matteo Capucci, Valeria de Paiva, Joseph Dorta, Brendan Fong, Richard Garner, Bruno Gavranovi\'c, Neil Ghani, Ben Goertzel, Tim Hosgood, Samantha Jarvis, Max Lieblich, Shaowei Lin, Owen Lynch, Joachim Kock, J\'er\'emie Koenig, Sophie Libkind, Joshua Meyers, Dominic Orchard, Nathaniel Osgood, Evan Patterson, Brandon Shapiro, Juliet Szatko, Tish Tanski, Todd Trimble, Adam Vandervorst, Jonathan Weinberger, and Christian Williams.
 
+We also thank our anonymous reviewers, who's advice made this book much more coherent.
+
 Finally, we thank our sponsors at the Air Force Office of Scientific Research, who has supported this work (and category theory itself) since the very beginning. In particular, this material is based upon work supported by the AFOSR under award numbers FA9550-20-1-0348 and FA9550-23-1-0376. 
 
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