diff --git a/include/math/interpolate.hh b/include/math/interpolate.hh
index af7552d..26e8848 100644
--- a/include/math/interpolate.hh
+++ b/include/math/interpolate.hh
@@ -1,3 +1,20 @@
+// This file is part of monofonIC (MUSIC2)
+// A software package to generate ICs for cosmological simulations
+// Copyright (C) 2020 by Oliver Hahn
+// 
+// monofonIC 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.
+// 
+// monofonIC 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
 #pragma once
 
 #include <vector>
diff --git a/include/math/mat3.hh b/include/math/mat3.hh
index 75458ea..ba9aba6 100644
--- a/include/math/mat3.hh
+++ b/include/math/mat3.hh
@@ -1,8 +1,28 @@
+// This file is part of monofonIC (MUSIC2)
+// A software package to generate ICs for cosmological simulations
+// Copyright (C) 2020 by Oliver Hahn
+// 
+// monofonIC 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.
+// 
+// monofonIC 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+#pragma once
+
 #include <gsl/gsl_math.h>
 #include <gsl/gsl_eigen.h>
 
 #include <math/vec3.hh>
 
+//! class for 3x3 matrix calculations
 template<typename T>
 class mat3_t{
 protected:
diff --git a/include/math/ode_integrate.hh b/include/math/ode_integrate.hh
index d4c91d5..73b22df 100644
--- a/include/math/ode_integrate.hh
+++ b/include/math/ode_integrate.hh
@@ -1,12 +1,23 @@
-#pragma once
-/*******************************************************************************\
- odetools.hh - This file is part of MUSIC2 -
- a code to generate initial conditions for cosmological simulations 
- 
- CHANGELOG (only majors, for details see repo):
-    06/2019 - Oliver Hahn - first implementation
-\*******************************************************************************/
+// This file is part of monofonIC (MUSIC2)
+// A software package to generate ICs for cosmological simulations
+// Copyright (C) 2020 by Oliver Hahn
+// 
+// monofonIC 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.
+// 
+// monofonIC 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 
+#pragma once
+
+//! ODE integration namespace
 namespace ode_integrate
 {
 
diff --git a/include/math/vec3.hh b/include/math/vec3.hh
index 3d1fe44..bbaffbc 100644
--- a/include/math/vec3.hh
+++ b/include/math/vec3.hh
@@ -1,10 +1,20 @@
-/*******************************************************************\
- vec3_t.hh - This file is part of MUSIC2 -
- a code to generate initial conditions for cosmological simulations 
- 
- CHANGELOG (only majors, for details see repo):
-    06/2019 - Oliver Hahn - first implementation
-\*******************************************************************/
+// This file is part of monofonIC (MUSIC2)
+// A software package to generate ICs for cosmological simulations
+// Copyright (C) 2020 by Oliver Hahn
+// 
+// monofonIC 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.
+// 
+// monofonIC 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
 #pragma once
 
 //! implements a simple class of 3-vectors of arbitrary scalar type