diff --git a/specs/validator/0_beacon-chain-validator.md b/specs/validator/0_beacon-chain-validator.md
index a79b178b3..3d679a991 100644
--- a/specs/validator/0_beacon-chain-validator.md
+++ b/specs/validator/0_beacon-chain-validator.md
@@ -379,7 +379,7 @@ def is_aggregator(state: BeaconState, slot: Slot, index: CommitteeIndex, slot_si
 
 If the validator is selected to aggregate (`is_aggregator()`), they construct an aggregate attestation via the following.
 
-Collect `attestations` seen via gossip during the `slot` that have an equivalent `attestation_data` to that constructed by the validator, and create an `aggregate_attestation` with the following fields.
+Collect `attestations` seen via gossip during the `slot` that have an equivalent `attestation_data` to that constructed by the validator, and create an `aggregate_attestation: Attestation` with the following fields.
 
 ##### Data