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diff --git a/src/mongo/db/mirror_maestro.idl b/src/mongo/db/mirror_maestro.idl
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+# Copyright (C) 2020-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.
+
+global:
+  cpp_namespace: mongo
+  cpp_includes:
+  - "mongo/db/mirror_maestro.h"
+
+imports:
+  - "mongo/idl/basic_types.idl"
+
+structs:
+  MirroredReadsParameters:
+    description: "A struct representing how to mirror read command requests"
+    strict: true
+    fields:
+      samplingRate:
+        description: >-
+            A floating-point value within [0.0,1.0] specifying what fraction of reads to sample
+        type: double
+        default: 0.0
+        validator:
+          gte: 0.0
+          lte: 1.0
+
+server_parameters:
+  mirrorReads:
+    description: "How to mirror read command requests"
+    set_at: [ startup, runtime ]
+    cpp_class:
+        name: "MirroredReadsServerParameter"
+        data: "synchronized_value<MirroredReadsParameters>"
+        override_set: true