bgp/application: Add note for BGPSpeaker API reference
@@ -104,6 +104,11 @@ Usage Example::
$ ryu-manager my_bgp_app.py \\
--bgp-app-config-file ryu/services/protocols/bgp/bgp_sample_conf.py
+.. note::
+
+ For the APIs for ``ryu.services.protocols.bgp.bgpspeaker.BGPSpeaker``,
+ please refer to :doc:`../library_bgp_speaker_ref`.
+
API Reference
=============
"""
