diff --git a/README.md b/README.md
index e7ea883..84d8268 100644
--- a/README.md
+++ b/README.md
@@ -16,18 +16,18 @@ services:
       - SERVER_HOST=<server-host>
       - USERNAME=<username>
       - PASSWORD=<password>
-      - DATA_DIR=<directory-path-to-sync>
       - SEAFILE_UID=<your_uid>
       - SEAFILE_GID=<your_gid>
     volumes:
-      - <host-volume-path>:<directory-path-to-sync>
+      - <host-volume-path>:/data
 ```
 
+Inside container libraries' content will be put in `/data` directory, so map your host directory to it.
+
 ## Environment variables:
  - `LIBRARY_ID=<your-library-id-here>`  ID of library to sync; multiple libraries could be separated by colon `:`
  - `SERVER_HOST=<server-host>`          Hostname of your seafile server, eg: seafile.example.com. If you're using non-standart port, specify it here, eg: seafile.example.com:8080
  - `USERNAME=<username>`                Seafile account username
  - `PASSWORD=<password>`                Seafile account password
- - `DATA_DIR=<directory-path-to-sync>`  The path where to put the files
  - `SEAFILE_UID=<uid>`                  Downloaded files will have this uid
  - `SEAFILE_GID=<gid>`                  Downloaded files will have this gid
diff --git a/docker-compose.example.yml b/docker-compose.example.yml
index c4ba9db..63396f9 100644
--- a/docker-compose.example.yml
+++ b/docker-compose.example.yml
@@ -9,8 +9,7 @@ services:
       - SERVER_HOST=<server-host>
       - USERNAME=<username>
       - PASSWORD=<password>
-      - DATA_DIR=<directory-path-to-sync>
       - SEAFILE_UID=<your_uid>
       - SEAFILE_GID=<your_gid>
     volumes:
-      - <host-volume-path>:<directory-path-to-sync>
+      - /home/johndow/seafile:/data
diff --git a/start.py b/start.py
index 93a1739..d4fef9b 100755
--- a/start.py
+++ b/start.py
@@ -11,9 +11,9 @@ from seafile_client.misc import setup_uid, create_dir
 
 def main():
     parser = argparse.ArgumentParser()
-    parser.add_argument("--uid", default=os.getenv("SEAFILE_UID"), type=int)
-    parser.add_argument("--gid", default=os.getenv("SEAFILE_GID"), type=int)
-    parser.add_argument("--data-dir", default=os.getenv("DATA_DIR"))
+    parser.add_argument("--uid", default=os.getenv("SEAFILE_UID", default=1000), type=int)
+    parser.add_argument("--gid", default=os.getenv("SEAFILE_GID", default=100), type=int)
+    parser.add_argument("--data-dir", default=os.getenv("DATA_DIR", default="/data"))
     parser.add_argument("--host", default=os.getenv("SERVER_HOST"))
     parser.add_argument("--username", default=os.getenv("USERNAME"))
     parser.add_argument("--password", default=os.getenv("PASSWORD"))