Fix markup.
diff --git a/Doc/library/robotparser.rst b/Doc/library/robotparser.rst
index 11ee0bd..cce7966 100644
--- a/Doc/library/robotparser.rst
+++ b/Doc/library/robotparser.rst
@@ -4,7 +4,7 @@
 
 .. module:: robotparser
    :synopsis: Loads a robots.txt file and answers questions about
-   fetchability of other URLs.
+              fetchability of other URLs.
 .. sectionauthor:: Skip Montanaro <skip@pobox.com>