diff --git a/specs/altair/beacon-chain.md b/specs/altair/beacon-chain.md
index f105419264..1de39d6fc7 100644
--- a/specs/altair/beacon-chain.md
+++ b/specs/altair/beacon-chain.md
@@ -71,7 +71,7 @@ Altair is the first beacon chain hard fork. Its main features are:
 
 | Name | SSZ equivalent | Description |
 | - | - | - |
-| `ParticipationFlags` | `byte` | a succinct representation of 8 boolean participation flags |
+| `ParticipationFlags` | `uint8` | a succinct representation of 8 boolean participation flags |
 
 ## Constants