docs: update readme to add more use-case

README.md

@@ -3,7 +3,8 @@ ObjInSync
 
 ![CI/CD](https://github.com/scribd/objinsync/workflows/CI/CD/badge.svg)
 
-Daemon to continuously synchronize a directory from remote object store to a local directory.
+Daemon to continuously and incrementally synchronize a directory from remote
+object store to a local directory.
 
 
 Usage
@@ -13,18 +14,24 @@ Usage
 objinsync pull --exclude '**/__pycache__/**' s3://bucket/keyprefix ./localdir
 ```
 
-When running in daemon mode (without `--once` flag), a healthcheck endpoint is
+When running in daemon mode (without `--once` flag), a health check endpoint is
 served at `:8087/health` and a prometheus metrics endponit is served at
 `:8087/metrics`. You can use `--status-addr` to override the binding address.
 
 Objinsync also comes with builtin Sentry integration. To enable it, set the
 `SENTRY_DSN` environment variable.
 
+You can also run objinsync in pull once mode, which behaves just like `aws s3 sync`:
+
+```bash
+objinsync pull --once s3://bucket/keyprefix ./localdir
+```
+
 
 Installation
 ------------
 
-Simply download the prebuilt binary from [release page](https://github.com/scribd/objinsync/releases) or use `go get` command:
+Simply download the prebuilt single binary from [release page](https://github.com/scribd/objinsync/releases) or use `go get` command:
 
 ```bash
 go get github.com/scribd/objinsync
@@ -46,4 +53,4 @@ Run from source
 AWS_REGION=us-east-2 go run main.go pull s3://qph-test-airflow-airflow-code/airflow_home/dags ./dags
 ```
 
-To cut a release, push tag to remote with format of `vx.x.x`.
+To cut a release, push tag to remote in the format of `vx.x.x`.