Update TAG file

diff --git a/doc/users/doxygen.html b/doc/users/doxygen.html
index 3c3621da5a20853d9d845c6dede2d32008e4d946..e9b807310ac7b1dea3dd20b94a525f15053a23e9 100644 (file)
--- a/doc/users/doxygen.html
+++ b/doc/users/doxygen.html
@@ -30,6 +30,7 @@
       Doxygen, if the online documentation is available,
       <a href="../doxygen/deal.II/index.html">here</a>. For older revisions,
        links are provided here by revision number:
+       <a href="http://www.dealii.org/9.0.0/doxygen/deal.tag">9.0.0</a>,
        <a href="http://www.dealii.org/8.5.0/doxygen/deal.tag">8.5.0</a>,
        <a href="http://www.dealii.org/8.4.2/doxygen/deal.tag">8.4.2</a>,
        <a href="http://www.dealii.org/8.3.0/doxygen/deal.tag">8.3.0</a>,