diff --git a/Sources/SwiftOptions/Options.swift b/Sources/SwiftOptions/Options.swift
index b25757767..035eac5d1 100644
--- a/Sources/SwiftOptions/Options.swift
+++ b/Sources/SwiftOptions/Options.swift
@@ -9,6 +9,13 @@
 // See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
 //
 //===----------------------------------------------------------------------===//
+//
+// NOTE: Generated file, do not edit!
+//
+// This file is generated from 'apple/swift:include/swift/Option/Options.td'.
+// Please see README.md#rebuilding-optionsswift for details
+//
+//===----------------------------------------------------------------------===//
 
 extension Option {
   public static let INPUT: Option = Option("<input>", .input, attributes: [.argumentIsPath])
diff --git a/Sources/makeOptions/makeOptions.cpp b/Sources/makeOptions/makeOptions.cpp
index a4ab3d4b5..3f8fafcef 100644
--- a/Sources/makeOptions/makeOptions.cpp
+++ b/Sources/makeOptions/makeOptions.cpp
@@ -232,6 +232,13 @@ int makeOptions_main() {
       "// See https://swift.org/LICENSE.txt for license information\n"
       "// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors\n"
       "//\n"
+      "//===----------------------------------------------------------------------===//\n"
+      "//\n"
+      "// NOTE: Generated file, do not edit!\n"
+      "//\n"
+      "// This file is generated from 'apple/swift:include/swift/Option/Options.td'.\n"
+      "// Please see README.md#rebuilding-optionsswift for details\n"
+      "//\n"
       "//===----------------------------------------------------------------------===//\n\n";
   out << "extension Option {\n";
   forEachOption([&](const RawOption &option) {