diff --git a/README.md b/README.md
index 5bb341916..51fcfbb0b 100755
--- a/README.md
+++ b/README.md
@@ -128,9 +128,11 @@ npm install -g phantomjs
 # 启动nodeppt server
 nodeppt start
 # 导出文件
-nodeppt pdf http://127.0.0.1:8080/md/demo.md -o a.pdf
+nodeppt pdf http://127.0.0.1:8080/md/demo.md a.pdf
 ```
 
+phantomjs版本可能较老，推荐在chrome浏览器中使用`ctrl+P`选择另存为pdf
+
 <a name="export-html"></a>
 #### html版
 
diff --git a/README_EN.md b/README_EN.md
index 837cd3d16..139fc7c44 100644
--- a/README_EN.md
+++ b/README_EN.md
@@ -115,7 +115,7 @@ npm install -g phantomjs
 # start nodeppt server
 nodeppt start
 # export file
-nodeppt pdf http://127.0.0.1:8080/md/demo.md -o a.pdf
+nodeppt pdf http://127.0.0.1:8080/md/demo.md a.pdf
 ```
 
 <a name="export-html"></a>