diff --git a/doc/source/man/cinder-manage.rst b/doc/source/man/cinder-manage.rst
index 2130a085c89..adc81b1082d 100644
--- a/doc/source/man/cinder-manage.rst
+++ b/doc/source/man/cinder-manage.rst
@@ -55,6 +55,16 @@ Cinder Db
 
     Purge database entries that are marked as deleted, that are older than the number of days specified.
 
+``cinder-manage db online_data_migrations``
+
+    Perform online data migrations for database upgrade between releases in batches.
+
+    This command interprets the following options when it is invoked:
+
+    --max_count     Maximum number of objects to consider.
+    --ignore_state  Force records to migrate even if another operation is
+                    performed on them. This may be dangerous, please refer to
+                    release notes for more information.
 
 Cinder Logs
 ~~~~~~~~~~~