--- a/text/intro.tex	Fri Jun 17 12:01:43 2011 -0600
+++ b/text/intro.tex	Fri Jun 17 12:12:53 2011 -0600
@@ -544,9 +544,9 @@
 \subsection{Thanks and acknowledgements}
 % attempting to make this chronological rather than alphabetical
 We'd like to thank 
-Justin Roberts, 
+Justin Roberts (for helpful discussions in the very early stages of this work), 
 Michael Freedman, 
-Peter Teichner, 
+Peter Teichner (for helping us improve an earlier version of the $n$-category definition), 
 David Ben-Zvi, 
 Vaughan Jones, 
 Chris Schommer-Pries,