+* policy: Please note the revisions to the :doc:`../contributing/abi_policy`
+ introducing major ABI versions, with DPDK 19.11 becoming the first major
+ version ``v20``. ABI changes to add new features continue to be permitted in
+ subsequent releases, with the condition that ABI compatibility with the major
+ ABI version is maintained.
+
+* net: The Ethernet address and other header definitions have changed
+ attributes. They have been modified to be aligned on 2-byte boundaries.
+ These changes should not impact normal usage because drivers naturally
+ align the Ethernet header on receive and all known encapsulations
+ preserve the alignment of the header.
+
+* security: The field ``replay_win_sz`` has been moved from ipsec library
+ based ``rte_ipsec_sa_prm`` structure to security library based structure
+ ``rte_security_ipsec_xform``, which specify the Anti replay window size
+ to enable sequence replay attack handling.
+
+* ipsec: The field ``replay_win_sz`` has been removed from the structure
+ ``rte_ipsec_sa_prm`` as it has been added to the security library.
+
+* ethdev: Added 32-bit fields for maximum LRO aggregated packet size, in
+ struct ``rte_eth_dev_info`` for the port capability and in struct
+ ``rte_eth_rxmode`` for the port configuration.
+ Application should use the new field in struct ``rte_eth_rxmode`` to configure
+ the requested size.
+ PMD should use the new field in struct ``rte_eth_dev_info`` to report the
+ supported port capability.
+