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-rw-r--r--src/undo-stack-observer.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/undo-stack-observer.h b/src/undo-stack-observer.h
index 58972a1af..0d277800b 100644
--- a/src/undo-stack-observer.h
+++ b/src/undo-stack-observer.h
@@ -1,10 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Authors:
* David Yip <yipdw@rose-hulman.edu>
*
* Copyright (c) 2005 Authors
*
- * Released under GNU GPL, read the file 'COPYING' for more information
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#ifndef SEEN_UNDO_COMMIT_OBSERVER_H