diff --git a/docs/THIRDPARTY b/docs/THIRDPARTY
index 3dc0414c9c..5d08efd3f9 100644
--- a/docs/THIRDPARTY
+++ b/docs/THIRDPARTY
@@ -134,6 +134,10 @@ Files: zerver/decorator.py zerver/management/commands/runtornado.py scripts/setu
 Copyright: Django Software Foundation and individual contributors
 License: BSD-3-Clause
 
+Files: static/audio/notification_sounds/*
+Copyright: 2021 Stefan Mertens
+License: CC0-1.0
+
 License: Apache-2.0
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
diff --git a/static/audio/notification_sounds/ascend.mp3 b/static/audio/notification_sounds/ascend.mp3
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diff --git a/static/audio/notification_sounds/ascend.ogg b/static/audio/notification_sounds/ascend.ogg
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diff --git a/static/audio/notification_sounds/beep_boop.mp3 b/static/audio/notification_sounds/beep_boop.mp3
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diff --git a/static/audio/notification_sounds/bink.mp3 b/static/audio/notification_sounds/bink.mp3
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diff --git a/static/audio/notification_sounds/bink.ogg b/static/audio/notification_sounds/bink.ogg
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diff --git a/static/audio/notification_sounds/bright.mp3 b/static/audio/notification_sounds/bright.mp3
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diff --git a/static/audio/notification_sounds/bright.ogg b/static/audio/notification_sounds/bright.ogg
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diff --git a/static/audio/notification_sounds/brlip.mp3 b/static/audio/notification_sounds/brlip.mp3
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diff --git a/static/audio/notification_sounds/brlip.ogg b/static/audio/notification_sounds/brlip.ogg
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index 0000000000..24a0133a09
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diff --git a/static/audio/notification_sounds/down.mp3 b/static/audio/notification_sounds/down.mp3
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diff --git a/static/audio/notification_sounds/down.ogg b/static/audio/notification_sounds/down.ogg
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diff --git a/static/audio/notification_sounds/dutdut.mp3 b/static/audio/notification_sounds/dutdut.mp3
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diff --git a/static/audio/notification_sounds/fast ascend.mp3 b/static/audio/notification_sounds/fast ascend.mp3
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index 0000000000..2c9ca0f074
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diff --git a/static/audio/notification_sounds/fast ascend.ogg b/static/audio/notification_sounds/fast ascend.ogg
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index 0000000000..1bb05c888f
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diff --git a/static/audio/notification_sounds/flute.mp3 b/static/audio/notification_sounds/flute.mp3
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index 0000000000..ad50523ea2
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diff --git a/static/audio/notification_sounds/flute.ogg b/static/audio/notification_sounds/flute.ogg
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diff --git a/static/audio/notification_sounds/friendly.mp3 b/static/audio/notification_sounds/friendly.mp3
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diff --git a/static/audio/notification_sounds/loud tintong.mp3 b/static/audio/notification_sounds/loud tintong.mp3
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diff --git a/static/audio/notification_sounds/pan.mp3 b/static/audio/notification_sounds/pan.mp3
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diff --git a/static/audio/notification_sounds/pan.ogg b/static/audio/notification_sounds/pan.ogg
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diff --git a/static/audio/notification_sounds/simple.mp3 b/static/audio/notification_sounds/simple.mp3
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diff --git a/static/audio/notification_sounds/simple.ogg b/static/audio/notification_sounds/simple.ogg
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diff --git a/static/audio/notification_sounds/stairs.mp3 b/static/audio/notification_sounds/stairs.mp3
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diff --git a/static/audio/notification_sounds/subtle.mp3 b/static/audio/notification_sounds/subtle.mp3
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diff --git a/static/audio/notification_sounds/subtle.ogg b/static/audio/notification_sounds/subtle.ogg
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diff --git a/static/audio/notification_sounds/tintong.mp3 b/static/audio/notification_sounds/tintong.mp3
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diff --git a/static/audio/notification_sounds/tintong.ogg b/static/audio/notification_sounds/tintong.ogg
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diff --git a/static/audio/notification_sounds/up.mp3 b/static/audio/notification_sounds/up.mp3
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diff --git a/static/audio/notification_sounds/zaping.mp3 b/static/audio/notification_sounds/zaping.mp3
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index 0000000000..bdde8e6705
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diff --git a/static/audio/notification_sounds/zaping.ogg b/static/audio/notification_sounds/zaping.ogg
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diff --git a/static/audio/notification_sounds/zing.mp3 b/static/audio/notification_sounds/zing.mp3
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diff --git a/static/audio/notification_sounds/zing.ogg b/static/audio/notification_sounds/zing.ogg
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