diff --git a/nps_active_space/config/template.config b/nps_active_space/config/template.config
index eac3ee3..207c18a 100644
--- a/nps_active_space/config/template.config
+++ b/nps_active_space/config/template.config
@@ -1,20 +1,53 @@
+# NPS-ActiveSpace configuration template.
+# Copy this file and rename it to <environment>.config (e.g. DENA.config),
+# then fill in the values for your deployment.
+# Usage: pass the environment name via -e, e.g. -e DENA
+
+# PostgreSQL connection for the overflights database.
+# Only needed for database-sourced tracks in run_ground_truthing.py
+# and run_audible_transits.py. Leave blank to use file-based tracks.
 [database:overflights]
 name =
 username =
 password =
-port =
-host =
+port = 5432
+host = localhost
 
+# Paths to input data sources.
 [data]
+# File containing site deployment metadata (coordinates, dates, etc.).
+# Required for run_ground_truthing.py and generate_active_space.py.
 site_metadata =
+# Root directory of the NVSPL sound pressure level archive.
+# Required for run_ground_truthing.py and generate_active_space.py.
 nvspl_archive =
+# Directory containing ADS-B aircraft track CSV files.
+# Required when using ADS-B tracks in run_ground_truthing.py
+# or run_audible_transits.py.
 adsb =
+# Directory containing MXAK AIS vessel track data.
+# Required when using AIS tracks in run_ground_truthing.py.
 ais =
+# Path to a DEM GeoTIFF covering the study area.
+# Required for generate_active_space.py and generate_active_space_mesh.py.
 dem =
+# Path to the Mennitt ambient sound level GeoTIFF.
+# Required for generate_active_space.py and generate_active_space_mesh.py.
 mennitt =
 
+# Project output paths and supporting files.
 [project]
+# Root directory for site project folders (each named UNITSITE, e.g. DENATRLA).
+# Required for all scripts.
 dir =
+# Path to the NMSIM Nord2000batch executable.
+# Required for generate_active_space.py and generate_active_space_mesh.py.
 nmsim =
-FAA_Releasable_db = 
-FAA_type_corrections = 
+# Path to the FAA Releasable Aircraft Database MASTER.txt file,
+# from https://www.faa.gov/licenses_certificates/aircraft_certification/aircraft_registry/releasable_aircraft_download
+# Required for run_audible_transits.py.
+FAA_Releasable_db =
+# Path to a JSON file with ICAO address corrections for aircraft types.
+# Keys are ICAO hex addresses, values are corrected aircraft type strings.
+# Required for run_ground_truthing.py and run_audible_transits.py.
+FAA_type_corrections =