--- manual/s_phys_pkgs/text/exf.tex	2010/08/30 23:09:21	1.13
+++ manual/s_phys_pkgs/text/exf.tex	2011/06/21 19:07:20	1.14
@@ -313,8 +313,16 @@
 \end{verbatim}
 
 EXF will read a file of name 'ncep\_qnet.bin'.
-Its first record represents January 1st, 1991 at 00:00 UTC.
+Its first record represents January 1st, 1992 at 00:00 UTC.
 Next record is 2592000 seconds (or 30 days) later.
+Note that the first record read and used by the EXF package corresponds to the
+value 'startDate1' set in data.cal.  Therefore if you want to start the EXF
+forcing from later in the 'ncep_qnet.bin' file, it suffices to specify
+startDate1 in data.cal as a date later than 19920101 (for example, startDate1
+= 19940101, for starting January 1st, 1994).  For this to work,
+'ncep_qnet.bin' must have at least 2 years of data because in this
+configuration EXF will read 2 years into the file to find the 1994 starting
+value.
 Interpolation on-the-fly is used (in the present case trivially
 on the same grid, but included nevertheless for illustration), 
 and input field grid starting coordinates and increments are