diff --git a/cdnjs-git-miner b/cdnjs-git-miner
index 47e5534..1634d4d 100755
--- a/cdnjs-git-miner
+++ b/cdnjs-git-miner
@@ -15,6 +15,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
+# SPDX-License-Identifier: GPL-3.0-or-later
 """ Tool for mining the cdnjs git repository"""
 
 import getopt