diff --git a/beamerthemem.sty b/beamerthemem.sty
index 5bd9df5..c20ba4c 100644
--- a/beamerthemem.sty
+++ b/beamerthemem.sty
@@ -1,4 +1,11 @@
-% Taken from https://github.com/hsrmbeamertheme/hsrmbeamertheme
+% Beamer mtheme
+%
+% Copyright 2014 Matthias Vogelgesang
+% Licensed under CC-BY-SA 4.0 International.
+%
+% The initial template comes from the HSRM beamer theme by Benjamin Weiss, which
+% you can find at https://github.com/hsrmbeamertheme/hsrmbeamertheme.
+%
 
 \ProvidesPackage{beamerthemem}