diff --git a/include/helpers.h b/include/helpers.h
index a473b55..7d9234c 100644
--- a/include/helpers.h
+++ b/include/helpers.h
@@ -1,3 +1,20 @@
+/*
+ *  This file is part of uIRC. (https://git.redxen.eu/caskd/uIRC)
+ *  Copyright (c) 2019, 2020 Alex-David Denes
+ *
+ *  uIRC 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
+ *  any later version.
+ *
+ *  uIRC 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 uIRC.  If not, see <https://www.gnu.org/licenses/>.
+*/
 #include "structs.h"
 #include <stdbool.h>
 #ifdef UIRC_HELPERS
diff --git a/include/mappings.h b/include/mappings.h
index 6e344ca..3183d17 100644
--- a/include/mappings.h
+++ b/include/mappings.h
@@ -1,3 +1,20 @@
+/*
+ *  This file is part of uIRC. (https://git.redxen.eu/caskd/uIRC)
+ *  Copyright (c) 2019, 2020 Alex-David Denes
+ *
+ *  uIRC 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
+ *  any later version.
+ *
+ *  uIRC 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 uIRC.  If not, see <https://www.gnu.org/licenses/>.
+*/
 #ifndef _UIRC_ENUMS_INCLUDED
 #define _UIRC_ENUMS_INCLUDED
 
diff --git a/include/structs.h b/include/structs.h
index 4028615..afa4ede 100644
--- a/include/structs.h
+++ b/include/structs.h
@@ -1,3 +1,20 @@
+/*
+ *  This file is part of uIRC. (https://git.redxen.eu/caskd/uIRC)
+ *  Copyright (c) 2019, 2020 Alex-David Denes
+ *
+ *  uIRC 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
+ *  any later version.
+ *
+ *  uIRC 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 uIRC.  If not, see <https://www.gnu.org/licenses/>.
+*/
 #include <stdbool.h>
 #ifndef _UIRC_STRUCTS_INCLUDED
 #define _UIRC_STRUCTS_INCLUDED
diff --git a/src/helpers.c b/src/helpers.c
index 1777b50..5459291 100644
--- a/src/helpers.c
+++ b/src/helpers.c
@@ -1,3 +1,20 @@
+/*
+ *  This file is part of uIRC. (https://git.redxen.eu/caskd/uIRC)
+ *  Copyright (c) 2019, 2020 Alex-David Denes
+ *
+ *  uIRC 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
+ *  any later version.
+ *
+ *  uIRC 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 uIRC.  If not, see <https://www.gnu.org/licenses/>.
+*/
 #include "../include/uirc.h"
 #include <stdbool.h>
 #include <stdio.h>