diff --git a/specs/core/0_beacon-chain.md b/specs/core/0_beacon-chain.md
index 0f020be531..41e7494485 100644
--- a/specs/core/0_beacon-chain.md
+++ b/specs/core/0_beacon-chain.md
@@ -1900,7 +1900,7 @@ For each `index` in `previous_epoch_attester_indices`, we determine the proposer
 For every `slot in range(get_epoch_start_slot(previous_epoch), get_epoch_start_slot(current_epoch))`:
 
 * Let `crosslink_committees_at_slot = get_crosslink_committees_at_slot(state, slot)`.
-* For every `(crosslink_committee, shard)` in `crosslink_committees_at_slot`:
+* For every `(crosslink_committee, shard)` in `crosslink_committees_at_slot` and every `index` in `crosslink_committee`:
     * If `index in attesting_validators(crosslink_committee)`, `state.validator_balances[index] += base_reward(state, index) * total_attesting_balance(crosslink_committee) // get_total_balance(state, crosslink_committee))`.
     * If `index not in attesting_validators(crosslink_committee)`, `state.validator_balances[index] -= base_reward(state, index)`.