diff --git a/README.md b/README.md
index fb1442c..d6d1eb8 100644
--- a/README.md
+++ b/README.md
@@ -67,6 +67,8 @@ a PostgreSQL or Clickhouse database.
        docs/tutorial/substreams.yaml
    ```
 
+   > **Note** You can use environment variables for all commands using the syntax `SINK_SQL_{COMMAND}_{FLAG}={value}` (e.g. `SINK_SQL_RUN_UNDO_BUFFER_SIZE=100` is equivalent to `substreams-sink-sql run [...] --undo-buffer-size 100`)
+
 1. Tear down your Docker Compose cluster
 
    ```bash