[LICENSE] Add SPDX Identifier
diff --git a/utils/examples/mag2gds.tcl b/utils/examples/mag2gds.tcl
index 5283852..84eabd2 100644
--- a/utils/examples/mag2gds.tcl
+++ b/utils/examples/mag2gds.tcl
@@ -11,6 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+# SPDX-License-Identifier: Apache-2.0
 
 # assumes an /ef tree or at least a symlink
 drc off