diff --git a/papers/format.md b/papers/format.md
index 92f8b0edf..d8e12b7bd 100644
--- a/papers/format.md
+++ b/papers/format.md
@@ -256,6 +256,8 @@ size | description
      |   - 0xe0: QSound - 19 channels
      |   - 0xe1: PS1 - 24 channels (UNAVAILABLE)
      |   - 0xe2: C64 (6581) with PCM - 4 channels (UNAVAILABLE)
+     |   - 0xe3: Watara Supervision - 4 channels (UNAVAILABLE)
+     |   - 0xe4: µPD1771C - 1 channel (UNAVAILABLE)
      |   - 0xf0: SID2 - 3 channels
      |   - 0xf1: 5E01 - 5 channels
      |   - 0xfc: Pong - 1 channel