--- MITgcm_contrib/osse/README	2004/06/08 17:37:45	1.4
+++ MITgcm_contrib/osse/README	2004/06/08 19:52:21	1.5
@@ -53,9 +53,7 @@
 
 From the MITgcm root:
 
-cd verification/osse
-mkdir build   # directory name is arbitrary  
-cd build
+cd verification/osse/build  
 ../../../tools/genmake -mods=../code  # creates makefile
 make depend       # contructs Fortran code from model codebase
 make              # makes executable mitgcmuv
@@ -68,6 +66,20 @@
 files.
 
 The data assimilation code is made by typing ``make'' in the filter
-directory.
+directory, which creates an executable named osse.  
+
+Before running osse, the initial ensemble needs to be set up by
+running the mkens script in verification/osse/da.  mkens creates the
+directories, symbolically links files necessary to run the model, and
+copies in the initial ensemble files.  osse should be run from the
+directory verification/osse/da/inits since it expects the ensemble
+members to be one directory above.  It also expects to have in its
+working directory the file iobsloc-003.txt, which contains the
+locations of the observations.  This file is located in
+verification/osse/da/inits.
+
+
+
+