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-rw-r--r--src/composite-undo-stack-observer.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/composite-undo-stack-observer.cpp b/src/composite-undo-stack-observer.cpp
index 621ab4306..ce272b2f5 100644
--- a/src/composite-undo-stack-observer.cpp
+++ b/src/composite-undo-stack-observer.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Heavily inspired by Inkscape::XML::CompositeNodeObserver.
*
@@ -6,7 +7,7 @@
*
* 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.
*/
#include <algorithm>