diff --git a/source/reference/mongodb-extended-json.txt b/source/reference/mongodb-extended-json.txt
index b4f8d2e6685..a9dad8030e9 100644
--- a/source/reference/mongodb-extended-json.txt
+++ b/source/reference/mongodb-extended-json.txt
@@ -211,8 +211,8 @@ Regular Expression
   any nonconforming options will be dropped when converting to this
   representation.
 
-OID
-~~~
+ObjectId
+~~~~~~~~
 
 .. bsontype:: data_oid