diff --git a/doc/source/admin/config-ipv6.rst b/doc/source/admin/config-ipv6.rst
index 7481e79c69b..9c6924f00d4 100644
--- a/doc/source/admin/config-ipv6.rst
+++ b/doc/source/admin/config-ipv6.rst
@@ -490,6 +490,12 @@ endpoints can be accessed via an IPv6 network. At this time, Open vSwitch
 Prefix delegation
 ~~~~~~~~~~~~~~~~~
 
+.. warning::
+
+   This feature is experimental with low test coverage, and the Dibbler client
+   which is used for this feature is no longer maintained. For details see:
+   https://github.com/tomaszmrugalski/dibbler#project-status
+
 From the Liberty release onwards, OpenStack Networking supports IPv6 prefix
 delegation. This section describes the configuration and workflow steps
 necessary to use IPv6 prefix delegation to provide automatic allocation of
diff --git a/neutron/conf/common.py b/neutron/conf/common.py
index aa0f4c2018b..e57917e73b7 100644
--- a/neutron/conf/common.py
+++ b/neutron/conf/common.py
@@ -66,7 +66,10 @@ core_opts = [
     cfg.IntOpt('max_subnet_host_routes', default=20,
                help=_("Maximum number of host routes per subnet")),
     cfg.BoolOpt('ipv6_pd_enabled', default=False,
-                help=_("Enables IPv6 Prefix Delegation for automatic subnet "
+                help=_("Warning: This feature is experimental with low test "
+                       "coverage, and the Dibbler client which is used for "
+                       "this feature is no longer maintained! "
+                       "Enables IPv6 Prefix Delegation for automatic subnet "
                        "CIDR allocation. "
                        "Set to True to enable IPv6 Prefix Delegation for "
                        "subnet allocation in a PD-capable environment. Users "