diff --git a/backend/test_observer/controllers/artefacts/artefacts.py b/backend/test_observer/controllers/artefacts/artefacts.py
index aca400b4..787a19fa 100644
--- a/backend/test_observer/controllers/artefacts/artefacts.py
+++ b/backend/test_observer/controllers/artefacts/artefacts.py
@@ -1,3 +1,22 @@
+# Copyright 2023 Canonical Ltd.
+# All rights reserved.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+# Written by:
+#        Omar Selo <omar.selo@canonical.com>
+#        Nadzeya Hutsko <nadzeya.hutsko@canonical.com>
 from fastapi import APIRouter, Depends
 from sqlalchemy.orm import Session
 from test_observer.data_access.models import ArtefactBuild
diff --git a/backend/test_observer/controllers/artefacts/models.py b/backend/test_observer/controllers/artefacts/models.py
index d96cff02..2a89263d 100644
--- a/backend/test_observer/controllers/artefacts/models.py
+++ b/backend/test_observer/controllers/artefacts/models.py
@@ -1,3 +1,22 @@
+# Copyright 2023 Canonical Ltd.
+# All rights reserved.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+# Written by:
+#        Omar Selo <omar.selo@canonical.com>
+#        Nadzeya Hutsko <nadzeya.hutsko@canonical.com>
 from pydantic import BaseModel
 
 
diff --git a/backend/test_observer/controllers/router.py b/backend/test_observer/controllers/router.py
index a3decc8b..474279fd 100644
--- a/backend/test_observer/controllers/router.py
+++ b/backend/test_observer/controllers/router.py
@@ -1,3 +1,22 @@
+# Copyright 2023 Canonical Ltd.
+# All rights reserved.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+# Written by:
+#        Omar Selo <omar.selo@canonical.com>
+#        Nadzeya Hutsko <nadzeya.hutsko@canonical.com>
 from fastapi import APIRouter, Depends
 from sqlalchemy import text
 from sqlalchemy.orm import Session
diff --git a/backend/tests/controllers/artefacts/test_artefacts.py b/backend/tests/controllers/artefacts/test_artefacts.py
index 636ee82e..1eb0fdf8 100644
--- a/backend/tests/controllers/artefacts/test_artefacts.py
+++ b/backend/tests/controllers/artefacts/test_artefacts.py
@@ -1,3 +1,22 @@
+# Copyright 2023 Canonical Ltd.
+# All rights reserved.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+# Written by:
+#        Omar Selo <omar.selo@canonical.com>
+#        Nadzeya Hutsko <nadzeya.hutsko@canonical.com>
 from fastapi.testclient import TestClient
 from sqlalchemy.orm import Session
 from test_observer.data_access.models import Environment, TestExecution
diff --git a/backend/tests/controllers/promoter/test_promoter.py b/backend/tests/controllers/promoter/test_promoter.py
index 7667d160..c9586c84 100644
--- a/backend/tests/controllers/promoter/test_promoter.py
+++ b/backend/tests/controllers/promoter/test_promoter.py
@@ -17,7 +17,7 @@
 # Written by:
 #        Nadzeya Hutsko <nadzeya.hutsko@canonical.com>
 #        Omar Selo <omar.selo@canonical.com>
-"""Test snap manager API"""
+"""Test promoter API"""
 
 
 from datetime import datetime, timedelta