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diff --git a/src/mongo/s/request_types/configure_collection_balancing.idl b/src/mongo/s/request_types/configure_collection_balancing.idl
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+# Copyright(C) 2021 - present MongoDB, Inc.
+#
+# This program is free software : you can redistribute it and / or modify
+# it under the terms of the Server Side Public License, version 1,
+# as published by MongoDB, Inc.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
+# Server Side Public License for more details.
+#
+# You should have received a copy of the Server Side Public License
+# along with this program.If not, see
+# < http://www.mongodb.com/licensing/server-side-public-license>.
+#
+# As a special exception, the copyright holders give permission to link the
+# code of portions of this program with the OpenSSL library under certain
+# conditions as described in each individual source file and distribute
+# linked combinations including the program with the OpenSSL library.You
+# must comply with the Server Side Public License in all respects for
+# all of the code used other than as permitted herein.If you modify file(s)
+# with this exception, you may extend this exception to your version of the
+# file(s), but you are not obligated to do so.If you do not wish to do so,
+# delete this exception statement from your version.If you delete this
+# exception statement from all source files in the program, then also delete
+# it in the license file.
+#
+
+# _configsvrConfigureCollectionBalancing and configureCollectionBalancing IDL File
+
+global:
+    cpp_namespace: "mongo"
+
+imports:
+    - "mongo/idl/basic_types.idl"
+
+feature_flags:
+  featureFlagPerCollBalancingSettings:
+    description: "Add capability to configure per collection balancing settings."
+    cpp_varname: feature_flags::gPerCollBalancingSettings
+    default: false
+
+structs:
+    configure_coll_balancing_params:
+        description: "Parameters for configureCollectionBalancing command"
+        fields:
+            chunkSize:
+                type: safeInt
+                cpp_name: chunkSizeMB
+                description: "New default chunk size in MiB, 0 will unset the collection specific chunk size."
+                optional: true
+            enableAutoSplitter: 
+                type: bool
+                description: "Specifies whether the auto-splitter should be running or not for this collection."
+                optional: true
+            balancerShouldMergeChunks:
+                type: bool
+                description: "Tell the balancer to merge chunks until they reach the new default chunk size"
+                optional: true
+
+commands:
+    configureCollectionBalancing:
+        command_name: configureCollectionBalancing
+        cpp_name: ConfigureCollectionBalancing
+        description: "Public configureCollectionBalancing command on mongos"
+        strict: false
+        namespace: type
+        api_version: ""
+        reply_type: OkReply
+        type: namespacestring
+        chained_structs:
+            configure_coll_balancing_params:
+                cpp_name: CollBalancingParams
+
+    _configsvrConfigureCollectionBalancing:
+        command_name: _configsvrConfigureCollectionBalancing
+        cpp_name: ConfigsvrConfigureCollectionBalancing
+        description: "Internal configureCollectionBalancing command on the config server"
+        strict: true
+        namespace: type
+        api_version: ""
+        type: namespacestring
+        chained_structs:
+            configure_coll_balancing_params:
+                cpp_name: CollBalancingParams