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diff --git a/lib/chibios/os/ex/dox/ex_rangefinder.dox b/lib/chibios/os/ex/dox/ex_rangefinder.dox
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+/*
+    ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+
+/**
+ * @defgroup EX_DISPLAYS Generic Display Interface
+ * @brief   EX Generic Display Interface.
+ *
+ * @ingroup EX_ABSTRACT_PERIPHERALS
+ */