diff --git a/Runtime.c b/Runtime.c
index e753f21..9afd4dd 100644
--- a/Runtime.c
+++ b/Runtime.c
@@ -1,3 +1,22 @@
+/*
+ * Monicelli: an esoteric language compiler
+ * 
+ * Copyright (C) 2014 Stefano Sanfilippo
+ *
+ * This program 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.
+ *
+ * This program 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/>.
+ */
+
 #include "Runtime.h"
 
 #include <stdio.h>
diff --git a/Runtime.h b/Runtime.h
index badf559..21645f1 100644
--- a/Runtime.h
+++ b/Runtime.h
@@ -1,6 +1,25 @@
 #ifndef RUNTIME_H
 #define RUNTIME_H
 
+/*
+ * Monicelli: an esoteric language compiler
+ * 
+ * Copyright (C) 2014 Stefano Sanfilippo
+ *
+ * This program 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.
+ *
+ * This program 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/>.
+ */
+
 #include <stdint.h>
 
 typedef int8_t __Monicelli_Bool;
diff --git a/RuntimePrototypes.hpp b/RuntimePrototypes.hpp
index ff3b1ef..a2405ba 100644
--- a/RuntimePrototypes.hpp
+++ b/RuntimePrototypes.hpp
@@ -1,6 +1,25 @@
 #ifndef RUNTIME_PROTOTYPES_HPP
 #define RUNTIME_PROTOTYPES_HPP
 
+/*
+ * Monicelli: an esoteric language compiler
+ * 
+ * Copyright (C) 2014 Stefano Sanfilippo
+ *
+ * This program 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.
+ *
+ * This program 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/>.
+ */
+
 #include "Nodes.hpp"
 #include <map>
 #include <string>
diff --git a/Scope.hpp b/Scope.hpp
index d961fcb..562c045 100644
--- a/Scope.hpp
+++ b/Scope.hpp
@@ -1,6 +1,25 @@
 #ifndef SCOPE_HPP
 #define SCOPE_HPP
 
+/*
+ * Monicelli: an esoteric language compiler
+ * 
+ * Copyright (C) 2014 Stefano Sanfilippo
+ *
+ * This program 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.
+ *
+ * This program 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/>.
+ */
+
 #include <boost/optional.hpp>
 #include <boost/range/adaptor/reversed.hpp>