diff --git a/.gitignore b/.gitignore
index 9614a47..81ec080 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,3 +12,4 @@ dist/
 *.egg-info
 **/qtpy/**
 __pycache__
+.DS_Store
\ No newline at end of file
diff --git a/office/api/pdf.py b/office/api/pdf.py
index 99d9aad..1b9c1a1 100644
--- a/office/api/pdf.py
+++ b/office/api/pdf.py
@@ -71,7 +71,7 @@ def add_text_watermark(input_file, point, text='python-office',
     在PDF文档中添加文本水印。
     文档：http://www.python4office.cn/python-office/popdf/%E8%AF%BE%E7%A8%8B/7-add_watermark
     """
-    popdf.add_watermark(input_file, point, text,
+    popdf.add_text_watermark(input_file, point, text,
                         output_file, fontname, fontsize, color)