diff --git a/docs/generators/changelog/versions/2.12.md b/docs/generators/changelog/versions/2.12.md
index d709438499..d65f347436 100644
--- a/docs/generators/changelog/versions/2.12.md
+++ b/docs/generators/changelog/versions/2.12.md
@@ -18,6 +18,7 @@
 * Update sockjs-client by [harryadel](https://github.com/harryadel) [PR](https://github.com/meteor/meteor/pull/12590)
 * [Accounts] set custom collection by [dmromanov](https://github.com/dmromanov) [PR](https://github.com/meteor/meteor/pull/12591)
 * Wrappers to help in the async migration by [matheusccastroo](https://github.com/matheusccastroo) [PR](https://github.com/meteor/meteor/pull/12593)
+* Mongo query hangs all clients subscribed to a query/collection [KoenLav](https://github.com/KoenLav) [PR](https://github.com/meteor/meteor/pull/12587)
 
 #### Breaking Changes
 
@@ -102,6 +103,7 @@ you can use ```WARN_WHEN_USING_OLD_API``` before starting your meteor process.
     - Added `countDocuments` and `estimatedDocumentCount` types.
     - Added warning for when old style apis are being used, to use this feature, 
     use the variable`WARN_WHEN_USING_OLD_API=true` before starting the Meteor process.
+    - Oplog driver updated to not throw error when MongoDB server and Meteor client mismatch. [issue](https://github.com/meteor/meteor/issues/12516)
 
 * `npm-mongo@4.16.0`:
     - Updated MongoDB driver to 4.15.