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diff --git a/src/mongo/db/feature_compatibility_version_document.idl b/src/mongo/db/feature_compatibility_version_document.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/feature_compatibility_version_parser.h"
+
+
+imports:
+  - "mongo/db/basic_types.idl"
+
+structs:
+  featureCompatibilityVersionDocument:
+    description: "featureCompatibilityVersion on-disk document format"
+    generate_comparison_operators: true
+    fields:
+      _id:
+        type: string
+        description: "Key of the featureCompatibilityVersion state singleton document"
+        default: '"featureCompatibilityVersion"'
+      version:
+        description: "Effective featureCompatibilityVersion"
+        type: fcv_string
+      targetVersion:
+        description: "Target featureCompatibilityVersion for upgrade/downgrade"
+        type: fcv_string
+        optional: true
+      previousVersion:
+        description: >-
+          Previous featureCompatibilityVersion for downgrading states, will always be kLatest when
+          present
+        type: fcv_string
+        optional: true
+        validator:
+          callback: "FeatureCompatibilityVersionParser::validatePreviousVersionField"
+      changeTimestamp:
+        description: "Timestamp used to identify the 2-phase setFCV request. Both phases (kStart and
+                      kComplete) must have the same timestamp for the entire sequence, and every new
+                      sequence started must strictly have incrementing timestamp."
+        type: timestamp
+        optional: true