diff --git a/specs/validator/0_beacon-chain-validator.md b/specs/validator/0_beacon-chain-validator.md
index 49290b432..ef6e8bf25 100644
--- a/specs/validator/0_beacon-chain-validator.md
+++ b/specs/validator/0_beacon-chain-validator.md
@@ -238,7 +238,7 @@ A validator should create and broadcast the attestation halfway through the `slo
 First the validator should construct `attestation_data`, an [`AttestationData`](../core/0_beacon-chain.md#attestationdata) object based upon the state at the assigned slot.
 
 * Let `head_block` be the result of running the fork choice during the assigned slot.
-* Let `head_state` be the state of `head_block` processed through any empty slots up to the assigned slot.
+* Let `head_state` be the state of `head_block` processed through any empty slots up to the assigned slot using `process_slots(state, slot)`.
 
 ##### LMD GHOST vote
 
@@ -360,7 +360,7 @@ def is_proposer_at_slot(state: BeaconState,
     return get_beacon_proposer_index(state) == validator_index
 ```
 
-*Note*: To see if a validator is assigned to proposer during the slot, the validator must run an empty slot transition from the previous state to the current slot.
+*Note*: To see if a validator is assigned to proposer during the slot, the validator must run an empty slot transition from the previous state to the current slot using `process_slots(state, current_slot)`.
 
 
 ### Lookahead