diff --git a/doc/source/man/manila-manage.rst b/doc/source/man/manila-manage.rst
index 1e8b9cb239..554a4ec569 100644
--- a/doc/source/man/manila-manage.rst
+++ b/doc/source/man/manila-manage.rst
@@ -63,6 +63,12 @@ Manila Db
 
     Generate new migration.
 
+``manila-manage db purge <age_in_days>``
+
+    Purge deleted rows older than a given age from manila database tables.
+    If age_in_days is not given or is specified as 0 all available rows will
+    be deleted.
+
 Manila Logs
 ~~~~~~~~~~~