Update release notes for the new multi-process hotplug feature.

Signed-off-by: Qi Zhang <qi.z.zh...@intel.com>
 doc/guides/rel_notes/release_18_08.rst | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/doc/guides/rel_notes/release_18_08.rst 
index bc0124295..1251e4b5b 100644
--- a/doc/guides/rel_notes/release_18_08.rst
+++ b/doc/guides/rel_notes/release_18_08.rst
@@ -46,6 +46,12 @@ New Features
   Flow API support has been added to CXGBE Poll Mode Driver to offload
   flows to Chelsio T5/T6 NICs.
+* **Support device multi-process hotplug.**
+  Hotplug and hot-unplug for devices will now be supported in multiprocessing
+  scenario. Any ethdev devices created in the primary process will be regarded
+  as shared and will be available for all DPDK processes. Synchronization 
+  processes will be done using DPDK IPC.
 API Changes
@@ -60,6 +66,11 @@ API Changes
    Also, make sure to start the actual text at the margin.
+* eal: scope of rte_eal_hotplug_add and rte_eal_hotplug_remove is extended.
+  In primary-secondary process model, ``rte_eal_hotplug_add`` will guarantee
+  that device be attached on all processes, while ``rte_eal_hotplug_remove``
+  will guarantee device be detached on all processes.
 ABI Changes

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