diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..f4e486c
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+precheck_results
\ No newline at end of file
diff --git a/verilog/gl/user_proj_example.v b/verilog/gl/user_proj_example.v
index 1ff3547..19f49ae 100644
--- a/verilog/gl/user_proj_example.v
+++ b/verilog/gl/user_proj_example.v
@@ -1,3 +1,18 @@
+// SPDX-FileCopyrightText: 2020 Efabless Corporation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// 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
+
 module user_proj_example (wb_clk_i,
     wb_rst_i,
     wbs_ack_o,
diff --git a/verilog/gl/user_project_wrapper.v b/verilog/gl/user_project_wrapper.v
index 913e3ce..7ebcaf8 100644
--- a/verilog/gl/user_project_wrapper.v
+++ b/verilog/gl/user_project_wrapper.v
@@ -1,3 +1,18 @@
+// SPDX-FileCopyrightText: 2020 Efabless Corporation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// 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
+
 module user_project_wrapper (user_clock2,
     wb_clk_i,
     wb_rst_i,