#27345 Added more info about the use of _id and index restrictions

Joe Bennett · Joe Bennett · commit 8a4f01997aa0 · 2018-06-06T08:58:20.000+10:00
diff --git a/components/lock.rst b/components/lock.rst
@@ -466,6 +466,7 @@ method uses the Memcached's ``flush()`` method which purges and removes everythi
 MongoDbStore
 ~~~~~~~~~~~~
 
+The locked resouce name is indexed in the ``_id`` field of the lock collection.
 An indexed field's value in MongoDB can be a maximum of 1024 bytes in length
 inclusive of structural overhead.
 
