diff --git a/LICENSES b/LICENSES
index 09717ea6d..6032b44ea 100644
--- a/LICENSES
+++ b/LICENSES
@@ -62,6 +62,7 @@ specified and linked otherwise.
 - modules/installed/sharing/file_explorer.py :: -
 - modules/installed/sharing/sharing.py :: -
 - modules/installed/system/config.py :: -
+- modules/installed/system/diagnostics.py :: -
 - modules/installed/system/expert_mode.py :: -
 - modules/installed/system/system.py :: -
 - modules/installed/system/time_zones :: -
diff --git a/modules/installed/system/diagnostics.py b/modules/installed/system/diagnostics.py
index 50bce40e3..b87afb68d 100644
--- a/modules/installed/system/diagnostics.py
+++ b/modules/installed/system/diagnostics.py
@@ -1,3 +1,24 @@
+#
+# This file is part of Plinth.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero 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 Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+
+"""
+Plinth module for running diagnostics
+"""
+
 import os, cherrypy
 from gettext import gettext as _
 from auth import require