diff --git a/setup.cfg b/setup.cfg
index 31f506c42..60bb79db4 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -83,6 +83,7 @@ nova.ipv6_backend =
 
 nova.scheduler.host_manager =
     host_manager = nova.scheduler.host_manager:HostManager
+    # Deprecated starting from the 17.0.0 Queens release.
     ironic_host_manager = nova.scheduler.ironic_host_manager:IronicHostManager
 
 nova.scheduler.driver =