diff --git a/README.md b/README.md
index 4ab6ae5..23b9e0b 100644
--- a/README.md
+++ b/README.md
@@ -151,8 +151,8 @@ Only the command `logbook.compute` requires a running task server (celery) at th
 - `ogn.collect.database.import_ddb` - Import registered devices from the ddb
 - `ogn.collect.database.import_file` - Import registered devices from a local file
 - `ogn.collect.heatmap.update_beacon_receiver_distance_all` - Calculate the distance between aircraft and receiver for the last aircraft beacons
-- `ogn.collect.receiver.update_receivers` - Populate/update receiver table
-- `ogn.collect.logbook.compute_takeoff_and_landing` - Generate TakeoffLanding table
+- `ogn.collect.receiver.update_receivers` - Populate/update receiver table (requires postgresql-backend)
+- `ogn.collect.logbook.compute_takeoff_and_landing` - Generate TakeoffLanding table (requires postgresql-backend)
 
 If the task server is up and running, tasks could be started manually.
 
diff --git a/config/default.py b/config/default.py
index 94cbcf6..5ef98b6 100644
--- a/config/default.py
+++ b/config/default.py
@@ -15,14 +15,15 @@ CELERYBEAT_SCHEDULE = {
         'task': 'ogn.collect.heatmap.update_beacon_receiver_distance_all',
         'schedule': timedelta(minutes=5),
     },
-   'update-logbook': {
-       'task': 'ogn.collect.logbook.compute_takeoff_and_landing',
-       'schedule': timedelta(minutes=15),
-   },
-   'update-receiver-table': {
-       'task': 'ogn.collect.receiver.update_receivers',
-       'schedule': timedelta(minutes=5),
-   },
+# Only supported with postgresql backend
+#    'update-logbook': {
+#        'task': 'ogn.collect.logbook.compute_takeoff_and_landing',
+#        'schedule': timedelta(minutes=15),
+#    },
+#    'update-receiver-table': {
+#        'task': 'ogn.collect.receiver.update_receivers',
+#        'schedule': timedelta(minutes=5),
+#    },
 }
 
 CELERY_TIMEZONE = 'UTC'