diff --git a/specs/core/0_beacon-chain.md b/specs/core/0_beacon-chain.md
index db919c668..cd80499a0 100644
--- a/specs/core/0_beacon-chain.md
+++ b/specs/core/0_beacon-chain.md
@@ -139,7 +139,7 @@ An `AttestationRecord` has the following fields:
 ```python
 {
     data: AttestationSignedData
-    # Attester participation bitfield (2 bits per attester)
+    # Attester participation bitfield
     'attester_bitfield': 'bytes',
     # Proof of custody bitfield
     'poc_bitfield': 'bytes',