SPDXify the licerse references.

1 files changed, 1 insertions, 1 deletions

diff --git a/matrix.h b/matrix.h
index 85ebbe01..24717874 100644
--- a/matrix.h
+++ b/matrix.h
@@ -2,7 +2,7 @@
  * matrix.h - matrix-algebra prototypes
  *
  * This file is Copyright (c)2010 by the GPSD project
- * BSD terms apply: see the file COPYING in the distribution root for details.
+ * SPDX-License-Identifier: BSD-2-clause
  */
 
 extern bool matrix_invert(double mat[4][4], double inverse[4][4]);