diff --git a/NOTICE.md b/NOTICE.md
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+++ b/NOTICE.md
@@ -13,4 +13,7 @@ This project uses the following external assets:
 | `./temp/puff.wav` | https://freesound.org/people/JustInvoke/sounds/446124/ | Attribution 4 |
 | `./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 |
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+| `./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/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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