diff --git a/source/reference/command/killOp.txt b/source/reference/command/killOp.txt
index 8a31e87958d..b402be1b407 100644
--- a/source/reference/command/killOp.txt
+++ b/source/reference/command/killOp.txt
@@ -39,6 +39,14 @@ Definition
 
    .. include:: /includes/extracts/warning-terminating-ops-command.rst
 
+
+.. versionchanged:: 4.0
+
+   The ``killOp`` command can be run on a :binary:`~bin.mongos` and can
+   kill queries that span shards in a cluster. For information on how
+   to list sharding operations that are active on a mongos, see the
+   ``localOps`` parameter in  :pipeline:`$currentOp`.
+
 Access Control
 --------------
 
diff --git a/source/reference/method/db.killOp.txt b/source/reference/method/db.killOp.txt
index 436d63318eb..cc89c382671 100644
--- a/source/reference/method/db.killOp.txt
+++ b/source/reference/method/db.killOp.txt
@@ -27,6 +27,13 @@ Description
 
    .. include:: /includes/extracts/warning-terminating-ops-method.rst
 
+.. versionchanged:: 4.0
+
+   The ``db.killOp()`` method can be run on a :binary:`~bin.mongos` and can
+   kill queries that are running on more than one shard in a cluster.
+   For information on how to list sharding operations that are active on
+   a mongos, see the ``localOps`` parameter in  :pipeline:`$currentOp`.
+
 Access Control
 --------------
 
diff --git a/source/release-notes/4.0.txt b/source/release-notes/4.0.txt
index f6335b2e7ba..e813ea77184 100644
--- a/source/release-notes/4.0.txt
+++ b/source/release-notes/4.0.txt
@@ -735,6 +735,10 @@ Commands
 
   - ``uuids`` field that contains the collections and their
     corresponding UUIDs.
+ 
+- The command :dbcommand:`killOp` now supports termination of queries that are
+  running on a :binary:`~bin.mongos`. When run on the ``mongos``, :dbcommand:`killOp` 
+  can kill queries that are running in more than one shard.
 
 Network Layer Improvements
 ~~~~~~~~~~~~~~~~~~~~~~~~~~