diff --git a/tstester/config.json b/tstester/config.json
index de372ec..f2f90ea 100644
--- a/tstester/config.json
+++ b/tstester/config.json
@@ -1,27 +1,32 @@
 {
     "max_age": 86400,
-    "_comment": "extra secs values to try with the AddNewObs test",
+    "_comment_1": "max age in secs relative to current time (older observations are inaccessible)",
     "nstations": 3,
+    "_comment_2": "number of stations to generate",
     "bbox": {
         "min_lat": -60.5,
         "max_lat": 62.5,
         "min_lon": -10.5,
         "max_lon": 12.5
     },
+    "_comment_3": "bounding box for randomly generated station locations (no two stations will have the same location)",
     "params": {
         "min": 1,
         "max": 3
     },
+    "_comment_4": "minimum and maximum number of randomly generated params for a station",
     "time_res": {
         "60": 0.2,
         "600": 0.3,
         "3600": 0.5
     },
+    "_comment_5": "probability weights of time series resolutions (around 20% will have time res 60 secs, around 30% will have time res 600 secs, and so on)",
     "extra_secs": [
         60,
         600,
         3600
     ],
+    "_comment_6": "extra secs values to try with the AddNewObs test",
     "ts_other_metadata": {
         "sensor_location_quality": 9,
         "sensor_performance_quality": 9