--- manual/s_phys_pkgs/text/gridalt.tex	2006/06/28 15:35:07	1.11
+++ manual/s_phys_pkgs/text/gridalt.tex	2009/11/23 21:08:56	1.12
@@ -6,7 +6,8 @@
 
 \subsubsection {Introduction} 
 
-The gridalt package is designed to allow different components of MITgcm to
+The gridalt package \citep{mol:09} 
+is designed to allow different components of MITgcm to
 be run using horizontal and/or vertical grids which are different from the main 
 model grid. The gridalt routines handle the definition of the all the various
 alternative grid(s) and the mappings between them and the MITgcm grid.