diff --git a/matlab/distributions/ig1fun.m b/matlab/distributions/ig1fun.m
index a695bb2887ba6da16c6f5e3b9ef3a1e4a12c8b37..25aa4624c68cc06f9305e32e6a4f25d83a588c91 100644
--- a/matlab/distributions/ig1fun.m
+++ b/matlab/distributions/ig1fun.m
@@ -1,2 +1,19 @@
 function err = ig1fun(nu,mu2,sigma2)
-    err = 2*mu2*gamma(nu/2).^2-(sigma2+mu2)*(nu-2).*gamma((nu-1)/2).^2;
\ No newline at end of file
+% Copyright (C) 2011 Dynare Team
+%
+% This file is part of Dynare.
+%
+% Dynare 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.
+%
+% Dynare 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 Dynare.  If not, see <http://www.gnu.org/licenses/>.
+
+err = 2*mu2*gamma(nu/2).^2-(sigma2+mu2)*(nu-2).*gamma((nu-1)/2).^2;
\ No newline at end of file