diff --git a/doc/source/admin/config-sriov.rst b/doc/source/admin/config-sriov.rst
index b07852c6664..901dcbecd0f 100644
--- a/doc/source/admin/config-sriov.rst
+++ b/doc/source/admin/config-sriov.rst
@@ -541,3 +541,5 @@ Known limitations
      SR-IOV features may require a specific NIC driver version, depending on the vendor.
      Intel NICs, for example, require ixgbe version 4.4.6 or greater, and ixgbevf version
      3.2.2 or greater.
+* Attaching SR-IOV ports to existing servers is not currently supported, see
+  `bug 1708433 <https://bugs.launchpad.net/nova/+bug/1708433>`_ for details.