diff --git a/papers/format.md b/papers/format.md
index d5b9c67e6..503099b99 100644
--- a/papers/format.md
+++ b/papers/format.md
@@ -177,6 +177,7 @@ size | description
      |     - 0xaa: MSM6295 - 4 channels
      |     - 0xab: MSM6258 - 1 channel
      |     - 0xac: Commander X16 (VERA) - 17 channels
+     |     - 0xad: Bubble System - 2 channels
      |     - 0xb0: Seta/Allumer X1-010 - 16 channels
      |     - 0xde: YM2610B extended - 19 channels
      |     - 0xe0: QSound - 19 channels