[LICENSE] Add SPDX Identifier
diff --git a/openlane/user_proj_example/config.tcl b/openlane/user_proj_example/config.tcl
index 8675e62..52cc64f 100644
--- a/openlane/user_proj_example/config.tcl
+++ b/openlane/user_proj_example/config.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
set script_dir [file dirname [file normalize [info script]]]
