diff --git a/src/common/communication.cpp b/src/common/communication.cpp
index 0daf57b7..76a4328b 100644
--- a/src/common/communication.cpp
+++ b/src/common/communication.cpp
@@ -1,3 +1,19 @@
+// yabridge: a Wine VST bridge
+// Copyright (C) 2020  Robbert van der Helm
+//
+// 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 <https://www.gnu.org/licenses/>.
+
 #include "communication.h"
 
 intptr_t send_event(boost::asio::local::stream_protocol::socket& socket,
diff --git a/src/common/logging.cpp b/src/common/logging.cpp
index 8a3d02a0..5fe9be28 100644
--- a/src/common/logging.cpp
+++ b/src/common/logging.cpp
@@ -1,3 +1,19 @@
+// yabridge: a Wine VST bridge
+// Copyright (C) 2020  Robbert van der Helm
+//
+// 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 <https://www.gnu.org/licenses/>.
+
 #include "logging.h"
 
 #include <chrono>
diff --git a/src/common/serialization.h b/src/common/serialization.h
index fb6b6574..cdeedd60 100644
--- a/src/common/serialization.h
+++ b/src/common/serialization.h
@@ -1,3 +1,19 @@
+// yabridge: a Wine VST bridge
+// Copyright (C) 2020  Robbert van der Helm
+//
+// 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 <https://www.gnu.org/licenses/>.
+
 #include <bitsery/adapter/buffer.h>
 #include <bitsery/ext/pointer.h>
 #include <bitsery/ext/std_optional.h>