diff --git a/README.md b/README.md
index cbf8fd3..8d0805f 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,15 @@
-# cmd-registry-memory
\ No newline at end of file
+# cmd-registry-memory
+
+# Usage
+
+## Environment config
+
+* `NSM_LISTEN_ON`                - url to listen on. (default: "unix:///listen.on.socket")
+* `NSM_MAX_TOKEN_LIFETIME`       - maximum lifetime of tokens (default: "10m")
+* `NSM_REGISTRY_SERVER_POLICIES` - paths to files and directories that contain registry server policies (default: "etc/nsm/opa/common/.*.rego,etc/nsm/opa/registry/.*.rego,etc/nsm/opa/server/.*.rego")
+* `NSM_REGISTRY_CLIENT_POLICIES` - paths to files and directories that contain registry client policies (default: "etc/nsm/opa/common/.*.rego,etc/nsm/opa/registry/.*.rego,etc/nsm/opa/client/.*.rego")
+* `NSM_PROXY_REGISTRY_URL`       - url to the proxy registry that handles this domain
+* `NSM_EXPIRE_PERIOD`            - period to check expired NSEs (default: "1s")
+* `NSM_LOG_LEVEL`                - Log level (default: "INFO")
+* `NSM_OPEN_TELEMETRY_ENDPOINT`  - OpenTelemetry Collector Endpoint (default: "otel-collector.observability.svc.cluster.local:4317")
+* `NSM_METRICS_EXPORT_INTERVAL`  - interval between mertics exports (default: "10s")