Index: /trunk/doc/release.2015/ps1.datasystem/datasystem.tex
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--- /trunk/doc/release.2015/ps1.datasystem/datasystem.tex	(revision 42141)
+++ /trunk/doc/release.2015/ps1.datasystem/datasystem.tex	(revision 42142)
@@ -116,5 +116,8 @@
 The CCDs each consist of an $8\times8$ grid of $590 \times 598$
 pixel readout regions, yielding an effective $4846 \times 4868$
-detector.  Initial performance assessments are presented in
+detector.
+\textadd{The GPC1 CCDs have the ability to move charge in both
+  dimensions on the detector and are thus referred to as Orthogonal Transfer Arrays (OTAs).}
+Initial performance assessments are presented in
 \cite{2008SPIE.7014E..0DO}.  Routine observations are conducted remotely from the
 Advanced Technology Research Center in Kula, the main facility of the