diff --git a/specs/core/0_beacon-chain.md b/specs/core/0_beacon-chain.md
index 55791e25f5..105a333c3d 100644
--- a/specs/core/0_beacon-chain.md
+++ b/specs/core/0_beacon-chain.md
@@ -1504,7 +1504,7 @@ def get_attestation_deltas(state: BeaconState) -> Tuple[List[Gwei], List[Gwei]]:
             if index not in matching_target_attesting_indices:
                 penalties[index] += state.validator_registry[index].effective_balance * finality_delay // INACTIVITY_PENALTY_QUOTIENT
 
-    return [rewards, penalties]
+    return rewards, penalties
 ```
 
 ```python
@@ -1523,7 +1523,7 @@ def get_crosslink_deltas(state: BeaconState) -> Tuple[List[Gwei], List[Gwei]]:
                     rewards[index] += base_reward * attesting_balance // committee_balance
                 else:
                     penalties[index] += base_reward
-    return [rewards, penalties]
+    return rewards, penalties
 ```
 
 Run the following function: