diff --git a/src/3rdparty/openttd_social_integration_api/openttd_social_integration_api.h b/src/3rdparty/openttd_social_integration_api/openttd_social_integration_api.h
new file mode 100644
--- /dev/null
+++ b/src/3rdparty/openttd_social_integration_api/openttd_social_integration_api.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2024 OpenTTD project
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files
+ * (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge,
+ * publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/*
+ * Although all the source-files created by OpenTTD are licensed under the
+ * GPL-v2, this file is an exception. This file is part of the API for
+ * social integration plugins, and licensed under the MIT license, to allow
+ * for non-free implementations.
+ */
+
+/** @file openttd_social_integration_api.h Interface definitions for plugins to report/respond to social integration. */
+
+#ifndef OPENTTD_SOCIAL_INTEGRATION_API_H
+#define OPENTTD_SOCIAL_INTEGRATION_API_H
+
+#include "openttd_social_integration_api_v1.h"
+
+#endif /* OPENTTD_SOCIAL_INTEGRATION_API_H */