--- trunk/ssdePaper/nptSSD.tex	2003/09/03 21:36:09	743
+++ trunk/ssdePaper/nptSSD.tex	2003/09/10 15:38:43	757
@@ -154,6 +154,13 @@ Up to this point, a detailed look at the model's struc
 scale biological systems, such as membrane phase behavior, a specific
 interest within our group.
 
+One of the key limitations of this water model, however, is that it
+has been parameterized for use with the Ewald Sum technique for the
+handling of long-ranged interactions.  When studying very large
+systems, the Ewald summation and even particle-mesh Ewald become
+computational burdens with their respective ideal $N^\frac{3}{2}$ and
+$N\log N$ calculation scaling orders for $N$ particles.\cite{Darden99}
+
 Up to this point, a detailed look at the model's structure and ion
 solvation abilities has been performed.\cite{Ichiye96} In addition, a
 thorough investigation of the dynamic properties of SSD was performed
