diff --git a/LICENSE b/LICENSE
diff --git a/src/host.c b/src/host.c
@@ -1,4 +1,19 @@
-// TODO license header here
+/*
+ * kuriborosu
+ * Copyright (C) 2021 Filipe Coelho <falktx@falktx.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * For a full copy of the GNU Affero General Public License see LICENSE file.
+ */
 
 #include "host.h"
 

diff --git a/src/host.h b/src/host.h
@@ -1,4 +1,19 @@
-// TODO license header here
+/*
+ * kuriborosu
+ * Copyright (C) 2021 Filipe Coelho <falktx@falktx.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * For a full copy of the GNU Affero General Public License see LICENSE file.
+ */
 
 #pragma once
 

diff --git a/src/kuriborosu.c b/src/kuriborosu.c
@@ -1,4 +1,19 @@
-// TODO license header here
+/*
+ * kuriborosu
+ * Copyright (C) 2021 Filipe Coelho <falktx@falktx.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * For a full copy of the GNU Affero General Public License see LICENSE file.
+ */
 
 #include "host.h"
 

diff --git a/src/kuribu.c b/src/kuribu.c
@@ -1,4 +1,19 @@
-// TODO license header here
+/*
+ * kuriborosu
+ * Copyright (C) 2021 Filipe Coelho <falktx@falktx.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero 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 Affero General Public License for more details.
+ *
+ * For a full copy of the GNU Affero General Public License see LICENSE file.
+ */
 
 #include "host.h"