Convert external links to internal links. Fixes #2010.
diff --git a/Doc/howto/curses.rst b/Doc/howto/curses.rst
index 2953d36..9cbc827 100644
--- a/Doc/howto/curses.rst
+++ b/Doc/howto/curses.rst
@@ -1,3 +1,5 @@
+.. _curses-howto:
+
 **********************************
   Curses Programming with Python
 **********************************