diff --git a/engine/client/voice.c b/engine/client/voice.c
index 87696c0c..2096d862 100644
--- a/engine/client/voice.c
+++ b/engine/client/voice.c
@@ -1,3 +1,19 @@
+/*
+voice.c - voice chat implementation
+Copyright (C) 2022 Velaron
+Copyright (C) 2022 SNMetamorph
+
+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.
+*/
+
 #include "voice.h"
 
 wavdata_t *input_file;
diff --git a/engine/client/voice.h b/engine/client/voice.h
index c5e110e2..e5072896 100644
--- a/engine/client/voice.h
+++ b/engine/client/voice.h
@@ -1,3 +1,19 @@
+/*
+voice.h - voice chat implementation
+Copyright (C) 2022 Velaron
+Copyright (C) 2022 SNMetamorph
+
+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.
+*/
+
 #ifndef VOICE_H
 #define VOICE_H