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-rw-r--r--src/document-undo.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/document-undo.cpp b/src/document-undo.cpp
index b64e75dd0..9753c4970 100644
--- a/src/document-undo.cpp
+++ b/src/document-undo.cpp
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Undo/Redo stack implementation
*
@@ -10,7 +11,7 @@
* Copyright (C) 1999-2003 authors
* Copyright (C) 2001-2002 Ximian, Inc.
*
- * Released under GNU GPL, read the file 'COPYING' for more information
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
*
* Using the split document model gives sodipodi a very simple and clean
* undo implementation. Whenever mutation occurs in the XML tree,