diff --git a/Nasal/modules.nas b/Nasal/modules.nas
index 1ef6a7d29..2eae60474 100644
--- a/Nasal/modules.nas
+++ b/Nasal/modules.nas
@@ -1,3 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
+# NOTE! This copyright does *not* cover user models that use these Nasal
+# services by normal function calls - this is merely considered normal use
+# of the code, and does *not* fall under the heading of "derived work."
+
 #-------------------------------------------------------------------------------
 # modules.nas - Nasal module helper for Add-ons and re-loadable modules
 # author:       jsb
diff --git a/Nasal/route_manager.nas b/Nasal/route_manager.nas
index cdb565a0c..2447720e8 100644
--- a/Nasal/route_manager.nas
+++ b/Nasal/route_manager.nas
@@ -1,3 +1,11 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
+# NOTE! This copyright does *not* cover user models that use these Nasal
+# services by normal function calls - this is merely considered normal use
+# of the code, and does *not* fall under the heading of "derived work."
+#
+# Copyright (C) 2012-202 by James Turner
+
 # route_manager.nas -  FlightPlan delegate(s) corresponding to the built-
 # in route-manager dialog and GPS. Intended to provide a sensible default behaviour,
 # but can be disabled by an aircraft-specific FMS / GPS system.