diff --git a/NOTICE.md b/NOTICE.md
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--- a/NOTICE.md
+++ b/NOTICE.md
@@ -14,6 +14,10 @@ This project uses the following external assets:
 | `./temp/place.wav` | https://freesound.org/people/Planman/sounds/208111/ | CC0 |
 | `./temp/gore.wav` | https://freesound.org/people/MinecraftGamerLR/sounds/728695/ | Attribution 4 |
 | `./temp/bones.wav` | https://freesound.org/people/cliftonmcarlson/sounds/392883/ | CC0 |
-| `./temp/metallic_whistle.wav` | https://freesound.org/people/furbyguy/sounds/365643/| Attribution 4|
+| `./temp/metallic_whistle.wav` | https://freesound.org/people/furbyguy/sounds/365643/| Attribution 3|
 | `./temp/upgradeselect.wav` | https://freesound.org/people/TechspiredMinds/sounds/729216/| Attribution 4|
-| `./temp/upgrade.wav` | https://freesound.org/people/colorsCrimsonTears/sounds/607409/ | CC0 |
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+| `./temp/upgrade.wav` | https://freesound.org/people/colorsCrimsonTears/sounds/607409/ | CC0 |
+| `./temp/again.wav` | https://freesound.org/people/LorenzoTheGreat/sounds/417795/ | Attribution 3 |
+| `./temp/squelch.wav` | https://freesound.org/people/primeval_polypod/sounds/159389/ | Attribution 3 |
+| `./temp/arcade_cancel.flac` | https://freesound.org/people/plasterbrain/sounds/464912/ | CC0 |
+| `./temp/cancel.wav` | https://freesound.org/people/Kagateni/sounds/571510/ | CC0 |
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