# support to the database.
#
# At that point, we import the two PostGIS files, lwpostgis.sql and
-# spatial_ref_sys.sql. These are magic as far as I'm concerned, but
-# PostGIS requires them.
+# spatial_ref_sys.sql. The lwpostgis.sql file contains the geometry
+# functions, while spatial_ref_sys.sql contains a table of SRIDs, and
+# their associated properties. PostGIS requires both.
#
# Then, we import the Tiger data using shp2pgsql. The shapefiles
# should exist, since this task depends on the "data" task, which