diff --git a/Doc/library/urllib.robotparser.rst b/Doc/library/urllib.robotparser.rst
index 0cac2ad..f179de2 100644
--- a/Doc/library/urllib.robotparser.rst
+++ b/Doc/library/urllib.robotparser.rst
@@ -19,10 +19,10 @@
 structure of :file:`robots.txt` files, see http://www.robotstxt.org/orig.html.
 
 
-.. class:: RobotFileParser()
+.. class:: RobotFileParser(url='')
 
-   This class provides a set of methods to read, parse and answer questions
-   about a single :file:`robots.txt` file.
+   This class provides methods to read, parse and answer questions about the
+   :file:`robots.txt` file at *url*.
 
    .. method:: set_url(url)