diff --git a/Dockerfile b/Dockerfile
index 13177ea..31c5bd4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,4 +5,9 @@ LABEL Maintainer="AlicFeng <a@samego.com>" \
 COPY release/mysql_markdown_unix /usr/local/sbin/mysql_markdown
 
 RUN chmod a+x /usr/local/sbin/mysql_markdown && \
-    mkdir /data/
\ No newline at end of file
+    mkdir /data/
+
+WORKDIR /data
+
+ENTRYPOINT [ "/usr/local/sbin/mysql_markdown" ]
+CMD [ "--help" ]
diff --git a/README.md b/README.md
index e9b74fd..b12e1cc 100644
--- a/README.md
+++ b/README.md
@@ -51,6 +51,7 @@ Usage: mysql_markdown [options...]
 -c      charset.  default utf8
 -o      output.   default current location
 -t      tables.   default all table and support ',' separator for filter, every item can use regexp
+-l      language. default cn,support: cn,en
 
 # 使用
 ➜ mysql_markdown -p samego -d samego