diff --git a/da/rc/carbontracker.rc b/da/rc/carbontracker.rc
index c9364ce32c4a443d9086ed41d8b3c1e0195f70c9..7af1034679e39c02f2f9fd986cbcd090e099cf1d 100644
--- a/da/rc/carbontracker.rc
+++ b/da/rc/carbontracker.rc
@@ -1,8 +1,15 @@
 !!! Info for the CarbonTracker data assimilation system
 
+! For ObsPack
+!datadir         : /Volumes/Storage/CO2/carbontracker/input/ct08/
+!obspack.input.id   : obspack_co2_1_DEMONSTRATION_2012-01-27
+!obspack.input.dir   : /Users/peters/Modeling/${obspack.input.id}
+
+! For old carbontracker obs files
 datadir         : /Volumes/Storage/CO2/carbontracker/input/ct08/
 obs.input.dir   : ${datadir}/obsnc/with_fillvalue
 obs.input.fname : obs_forecast.nc
+
 ocn.covariance  : ${datadir}/oif_p3_era40.dpco2.2000.01.hdf 
 bio.covariance  : ${datadir}/covariance_bio_olson19.nc
 deltaco2.prefix : oif_p3_era40.dpco2
@@ -18,5 +25,8 @@ regionsfile     : ${regions.dir}/regions.nc
 
 ! Info on the sites file used
 
+! For ObsPack
+!obs.sites.rc        : ${PWD}/da/rc/sites_and_weights_ctdas.rc
+! For old CT
 obs.sites.rc        : ${datadir}/sites_and_weights_co2.ct10.rc