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-rw-r--r--doc/sphinx/arm/hooks-host-cmds.rst8
1 files changed, 8 insertions, 0 deletions
diff --git a/doc/sphinx/arm/hooks-host-cmds.rst b/doc/sphinx/arm/hooks-host-cmds.rst
index f5ce814120..7ba4f9db6f 100644
--- a/doc/sphinx/arm/hooks-host-cmds.rst
+++ b/doc/sphinx/arm/hooks-host-cmds.rst
@@ -271,6 +271,14 @@ As :isccmd:`reservation-add` is expected to store the host, the ``hosts-database
parameter must be specified in the configuration, and databases must not
run in read-only mode.
+.. note::
+
+ Since kea version 2.7.0 an empty reservation is implicitly global, i.e.
+ if no ``subnet-id`` entry is present and for DHCPv4 ``ip-address`` or
+ for DHCPv6 ``ip-addresses`` and ``prefixes`` do not specify a reserved
+ address or prefix the command is valid and adds a global (subnet id 0)
+ host reservation.
+
.. isccmd:: reservation-get
.. _command-reservation-get: