diff --git a/paper/gtt.tex b/paper/gtt.tex
index 1d381bb214d2a30e0dfc77a9237eb940e6791a2f..48d802acca74dafa41309cfc4395ebb818f10b9c 100644
--- a/paper/gtt.tex
+++ b/paper/gtt.tex
@@ -9759,6 +9759,24 @@ structure~\cite{ahman+16fiberedeffects}.
 
 \newpage
 
+\paragraph{Acknowledgements}
+
+We thank Gabriel?, Sam TH?, Ron?, MSFP people? FSCD people? for helpful
+discussions about this work.  We thank the anonymous reviewers for
+helpful feedback on a previous version of this article.  This material
+is based on research sponsored by the NSF? FIXME and the United States
+Air Force Research Laboratory under agreement number FA9550-15-1-0053
+and and FA9550-16-1-0292.
+%% The U.S. Government is
+%% authorized to reproduce and distribute reprints for Governmental
+%% purposes notwithstanding any copyright notation thereon.
+The views and conclusions contained herein are those of the authors and
+should not be interpreted as necessarily representing the official
+policies or endorsements, either expressed or implied, of the United
+States Air Force Research Laboratory, the U.S. Government, or Carnegie
+Mellon University.
+
+
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