diff --git a/.gitignore b/.gitignore
index ba90e8f8a..dc4cd1c5f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -42,3 +42,7 @@ run/
 
 # Nix/NixOS
 result/
+
+# Flatpak
+.flatpak-builder
+flatbuild
\ No newline at end of file
diff --git a/launcher/DesktopServices.cpp b/launcher/DesktopServices.cpp
index 5de97210d..f4226c154 100644
--- a/launcher/DesktopServices.cpp
+++ b/launcher/DesktopServices.cpp
@@ -1,3 +1,37 @@
+// SPDX-License-Identifier: GPL-3.0-only
+/*
+ *  PolyMC - Minecraft Launcher
+ *  Copyright (C) 2022 dada513 <dada513@protonmail.com>
+ *
+ *  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, version 3.
+ *
+ *  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/>.
+ *
+ * This file incorporates work covered by the following copyright and
+ * permission notice:
+ *
+ *      Copyright 2013-2022 MultiMC Contributors
+ *
+ *      Licensed under the Apache License, Version 2.0 (the "License");
+ *      you may not use this file except in compliance with the License.
+ *      You may obtain a copy of the License at
+ *
+ *          http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *      Unless required by applicable law or agreed to in writing, software
+ *      distributed under the License is distributed on an "AS IS" BASIS,
+ *      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *      See the License for the specific language governing permissions and
+ *      limitations under the License.
+ */
 #include "DesktopServices.h"
 #include <QDir>
 #include <QDesktopServices>
diff --git a/launcher/Flatpak.cpp b/launcher/Flatpak.cpp
index 8b61f903e..2c28903c3 100644
--- a/launcher/Flatpak.cpp
+++ b/launcher/Flatpak.cpp
@@ -1,3 +1,20 @@
+// SPDX-License-Identifier: GPL-3.0-only
+/*
+ *  PolyMC - Minecraft Launcher
+ *  Copyright (C) 2022 dada513 <dada513@protonmail.com>
+ *
+ *  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, version 3.
+ *
+ *  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 <QFileInfo>
 
 namespace Flatpak
@@ -10,5 +27,5 @@ namespace Flatpak
      #else
      return false;
      #endif
-   } 
+    } 
 }
diff --git a/launcher/Flatpak.h b/launcher/Flatpak.h
index da6eb7c30..50c6d7341 100644
--- a/launcher/Flatpak.h
+++ b/launcher/Flatpak.h
@@ -1,3 +1,20 @@
+// SPDX-License-Identifier: GPL-3.0-only
+/*
+ *  PolyMC - Minecraft Launcher
+ *  Copyright (C) 2022 dada513 <dada513@protonmail.com>
+ *
+ *  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, version 3.
+ *
+ *  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/>.
+ */
 namespace Flatpak
 {
     bool IsFlatpak();