diff --git a/src/core/detector/PixelModuleDetector.hpp b/src/core/detector/PixelModuleDetector.hpp
index 4bfd2c41ea1510b1a920c1e8c32c230b8e0b94bc..12d9103d5636dabca3d87473407ce499f4cc4eb8 100644
--- a/src/core/detector/PixelModuleDetector.hpp
+++ b/src/core/detector/PixelModuleDetector.hpp
@@ -4,6 +4,7 @@
  * This software is distributed under the terms of the MIT License, copied verbatim in the file "LICENSE.md".
  * In applying this license, CERN does not waive the privileges and immunities granted to it by virtue of its status as an
  * Intergovernmental Organization or submit itself to any jurisdiction.
+ * SPDX-License-Identifier: MIT
  */
 
 #ifndef CORRYVRECKAN_BIGPLANARDETECTOR_H