--- a/src/HOL/BNF/README.html Wed Nov 20 20:46:10 2013 +0100
+++ b/src/HOL/BNF/README.html Wed Nov 20 20:46:46 2013 +0100
@@ -20,7 +20,8 @@
possibly infinite depth. The framework draws heavily from category theory.
<p>
-The package is described in the following paper:
+The package is described in <tt>isabelle doc datatypes</tt> and in the following
+paper:
<ul>
<li><a href="http://www21.in.tum.de/~traytel/papers/lics12-codatatypes/index.html">Foundational, Compositional (Co)datatypes for Higher-Order Logic—Category Theory Applied to Theorem Proving</a>, <br>