diff --git a/tests/lua/cartesi/parallel.lua b/tests/lua/cartesi/parallel.lua
index 28087d768..9d1597282 100644
--- a/tests/lua/cartesi/parallel.lua
+++ b/tests/lua/cartesi/parallel.lua
@@ -1,3 +1,19 @@
+-- Copyright Cartesi and individual authors (see AUTHORS)
+-- SPDX-License-Identifier: LGPL-3.0-or-later
+--
+-- This program is free software: you can redistribute it and/or modify it under
+-- the terms of the GNU Lesser General Public License as published by the Free
+-- Software Foundation, either version 3 of the License, or (at your option) any
+-- later version.
+--
+-- This program is distributed in the hope that it will be useful, but WITHOUT ANY
+-- WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+-- PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+--
+-- You should have received a copy of the GNU Lesser General Public License along
+-- with this program (see COPYING). If not, see <https://www.gnu.org/licenses/>.
+--
+
 -- module to run things in parallel via fork + join
 local M = {}
 
diff --git a/tests/lua/cartesi/tabular.lua b/tests/lua/cartesi/tabular.lua
index 20d52339e..57f35048b 100644
--- a/tests/lua/cartesi/tabular.lua
+++ b/tests/lua/cartesi/tabular.lua
@@ -1,3 +1,20 @@
+-- Copyright Cartesi and individual authors (see AUTHORS)
+-- SPDX-License-Identifier: LGPL-3.0-or-later
+--
+-- This program is free software: you can redistribute it and/or modify it under
+-- the terms of the GNU Lesser General Public License as published by the Free
+-- Software Foundation, either version 3 of the License, or (at your option) any
+-- later version.
+--
+-- This program is distributed in the hope that it will be useful, but WITHOUT ANY
+-- WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+-- PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+--
+-- You should have received a copy of the GNU Lesser General Public License along
+-- with this program (see COPYING). If not, see <https://www.gnu.org/licenses/>.
+--
+
+-- module to convert array tables into key-value tables
 local M = {}
 
 -- convert a table with indexed rows into a table with named rows. e.g.