Consistency check for versionadded/changed directives.
diff --git a/Doc/using/cmdline.rst b/Doc/using/cmdline.rst
index 304f7c9..81d118b 100644
--- a/Doc/using/cmdline.rst
+++ b/Doc/using/cmdline.rst
@@ -115,6 +115,7 @@
    .. versionchanged:: 3.1
       Supply the package name to run a ``__main__`` submodule.
 
+
 .. describe:: -
 
    Read commands from standard input (:data:`sys.stdin`).  If standard input is