diff --git a/specs/beacon-chain.md b/specs/beacon-chain.md
index 290ead31f..a471b5e2e 100644
--- a/specs/beacon-chain.md
+++ b/specs/beacon-chain.md
@@ -609,13 +609,13 @@ For each one of these attestations:
 
 Extend the list of `AttestationRecord` objects in the `active_state` with those included in the block, ordering the new additions in the same order as they came in the block. Similarly extend the list of `SpecialRecord` objects in the `active_state` with those included in the block.
 
-Let `proposer_index` be the validator index of the `parent.slot % len(get_shards_and_committees_for_slot(crystallized_state, parent.slot)[0].committee)`'th attester in `get_shards_and_committees_for_slot(crystallized_state, parent.slot)[0]`. Verify that an attestation from this validator is part of the first (ie. item 0 in the array) `AttestationRecord` object; this attester can be considered to be the proposer of the parent block. In general, when a block is produced, it is broadcasted at the network layer along with the attestation from its proposer.
+Let `curblock_proposer_index` be the validator index of the `block.slot % len(get_shards_and_committees_for_slot(crystallized_state, block.slot)[0].committee)`'th attester in `get_shards_and_committees_for_slot(crystallized_state, block.slot)[0]`, and `parent_proposer_index` be the validator index of the parent block, calculated similarly. Verify that an attestation from the `parent_proposer_index`'th validator is part of the first (ie. item 0 in the array) `AttestationRecord` object; this attester can be considered to be the proposer of the parent block. In general, when a block is produced, it is broadcasted at the network layer along with the attestation from its proposer.
 
 Additionally, verify and update the RANDAO reveal. This is done as follows:
 
 * Let `repeat_hash(x, n) = x if n == 0 else repeat_hash(hash(x), n-1)`.
-* Let `V = crystallized_state.validators[proposer_index]`.
-* Verify that `repeat_hash(block.randao_reveal, (current_slot - V.randao_last_reveal) // RANDAO_SLOTS_PER_LAYER + 1) == V.randao_commitment`, and set `active_state.randao_mix = xor(active_state.randao_mix, block.randao_reveal)` and append to `ActiveState.pending_specials` a `SpecialObject(kind=RANDAO_CHANGE, data=[bytes8(proposer_index), block.randao_reveal])`.
+* Let `V = crystallized_state.validators[curblock_proposer_index]`.
+* Verify that `repeat_hash(block.randao_reveal, (current_slot - V.randao_last_reveal) // RANDAO_SLOTS_PER_LAYER + 1) == V.randao_commitment`, and set `active_state.randao_mix = xor(active_state.randao_mix, block.randao_reveal)` and append to `ActiveState.pending_specials` a `SpecialObject(kind=RANDAO_CHANGE, data=[bytes8(curblock_proposer_index), block.randao_reveal])`.
 
 ### State recalculations (every `CYCLE_LENGTH` slots)