diff --git a/src/new/thermal/FT_phase_map_from_thermal_lens.m b/src/new/thermal/FT_phase_map_from_thermal_lens.m
index e62f2dc67d12f87d08608478e4ce774afa573699..1d615eb1d8ca8314a99f4d67cb592a5be76f1129 100644
--- a/src/new/thermal/FT_phase_map_from_thermal_lens.m
+++ b/src/new/thermal/FT_phase_map_from_thermal_lens.m
@@ -25,6 +25,7 @@
 %           paraboloid.
 % Rc:       Radius of curvature of approximate thermal lens [m]
 %
+% Part of the Simtools package, http://www.gwoptics.org/simtools
 % Charlotte Bond    27.01.2013
 %--------------------------------------------------------------------------
 %