diff --git a/README.md b/README.md
index 95cc15f..9b81888 100644
--- a/README.md
+++ b/README.md
@@ -75,6 +75,19 @@ through H3 cells had the highest brightness (`mpsas` is the measure of brightnes
 spread over a square arcsecond of sky, where higher means darker sky with more
 stars visible)
 
+## changing the resolution
+
+By default, the producer runs over [resolution 0 cells](https://h3geo.org/docs/core-library/restable/),
+but this can be adjusted by setting the environment of the `producer` container in
+`docker-compose.yaml`:
+
+```yaml
+producer:
+  build: ./pp
+  environment:
+    RESOLUTION: 0
+```
+
 
 ## documentation
 
diff --git a/docker-compose.yml b/docker-compose.yml
index 30d2012..ec2f3be 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -49,6 +49,7 @@ services:
     environment:
       API_HOST: "api"
       RABBITMQ_HOST: "rabbitmq"
+      RESOLUTION: 0
     restart: on-failure
     depends_on:
       api:
diff --git a/pc/tests/test_consumer.py b/pc/tests/test_consumer.py
index 3d14e21..a88f17a 100644
--- a/pc/tests/test_consumer.py
+++ b/pc/tests/test_consumer.py
@@ -21,7 +21,8 @@ def consumer(mock_asyncpg_pool):
     amqp_url="amqp://localhost"
     prediction_queue="prediction"
     return Consumer(
-        url=amqp_url,prediction_queue=prediction_queue,
+        url=amqp_url,
+        prediction_queue=prediction_queue,
         cycle_queue="",
         connection_pool=mock_asyncpg_pool,
         on_cycle_completion=lambda _: None