diff --git a/verilog/gl/caravel.v b/verilog/gl/caravel.v
index c68e423..243ec45 100644
--- a/verilog/gl/caravel.v
+++ b/verilog/gl/caravel.v
@@ -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
 
 /* Generated by Yosys 0.9+3621 (git sha1 84e9fa7, gcc 8.3.1 -fPIC -Os) */