diff --git a/specs/core/0_beacon-chain.md b/specs/core/0_beacon-chain.md
index 9a3590d9a..33226aeee 100644
--- a/specs/core/0_beacon-chain.md
+++ b/specs/core/0_beacon-chain.md
@@ -1554,7 +1554,7 @@ For each `attestation` in `block.body.attestations`:
 * Verify bitfields and aggregate signature:
 
 ```python
-    assert attestation.custody_bitfield == 0 # [TO BE REMOVED IN PHASE 1]
+    assert attestation.custody_bitfield == 0  # [TO BE REMOVED IN PHASE 1]
 
     for i in range(len(crosslink_committee)):
         if get_bitfield_bit(attestation.aggregation_bitfield) == 0: