diff --git a/api-ref/source/parameters.yaml b/api-ref/source/parameters.yaml
index e9a3befb10ce..e30e6827d4da 100644
--- a/api-ref/source/parameters.yaml
+++ b/api-ref/source/parameters.yaml
@@ -2149,7 +2149,7 @@ host_memory_mb:
   type: string
 host_migration:
   description: |
-    The host to which to migrate the server. If you omit this parameter, the scheduler
+    The host to which to migrate the server. If this parameter is ``None``, the scheduler
     chooses a host.
   in: body
   required: true
diff --git a/api-ref/source/servers-admin-action.inc b/api-ref/source/servers-admin-action.inc
index f3508fee7330..cef4771c29fd 100644
--- a/api-ref/source/servers-admin-action.inc
+++ b/api-ref/source/servers-admin-action.inc
@@ -145,8 +145,8 @@ Live-migrates a server to a new host without rebooting.
 
 Specify the ``os-migrateLive`` action in the request body.
 
-Use the ``host`` parameter to specify the destination host. If you
-omit this parameter, the scheduler chooses a host. If a scheduled host
+Use the ``host`` parameter to specify the destination host. If
+this param is ``null``, the scheduler chooses a host. If a scheduled host
 is not suitable to do migration, the scheduler tries up to
 ``migrate_max_retries`` rescheduling attempts.