doc nit: fix a broken link

diff --git a/doc/upgrading.rst b/doc/upgrading.rst
index a2d7217806aff685c19b1137454b66a514c2530e..b41dd7a5a355034e3edae91056711f72810f7ac9 100644 (file)
--- a/doc/upgrading.rst
+++ b/doc/upgrading.rst
@@ -32,7 +32,7 @@ newer versions when they are released.
 5.x to 6.x
 ==========
 
-* see the more detailed guide for `upgrading to version 6.x <upgrading-to-6>`
+* see the more detailed guide for :ref:`upgrading to version 6.x <upgrading-to-6>`
 
 
 5.4 to 5.5