diff --git a/specs/altair/p2p-interface.md b/specs/altair/p2p-interface.md
index 6d400c0a2..ee6ab8292 100644
--- a/specs/altair/p2p-interface.md
+++ b/specs/altair/p2p-interface.md
@@ -92,7 +92,7 @@ The following validations MUST pass before forwarding the `signed_contribution_a
 - _[REJECT]_ `contribution_and_proof.selection_proof` selects the validator as an aggregator for the slot -- i.e. `is_sync_committee_aggregator(state, contribution.slot, contribution_and_proof.selection_proof)` returns `True`.
 - _[REJECT]_ The aggregator's validator index is within the current sync committee --
   i.e. `state.validators[contribution_and_proof.aggregator_index].pubkey in state.current_sync_committee.pubkeys`.
-- _[REJECT]_ The `contribution_and_proof.selection_proof` is a valid signature of the `contribution.slot` by the validator with index `contribution_and_proof.aggregator_index`.
+- _[REJECT]_ The `contribution_and_proof.selection_proof` is a valid signature of the `SyncCommitteeSigningData` derived from the `contribution` by the validator with index `contribution_and_proof.aggregator_index`.
 - _[REJECT]_ The aggregator signature, `signed_contribution_and_proof.signature`, is valid.
 - _[REJECT]_ The aggregate signature is valid for the message `beacon_block_root` and aggregate pubkey derived from the participation info in `aggregation_bits` for the subcommittee specified by the `subcommittee_index`.
 
diff --git a/specs/altair/validator.md b/specs/altair/validator.md
index c7b41dd8b..ae4c64d03 100644
--- a/specs/altair/validator.md
+++ b/specs/altair/validator.md
@@ -310,12 +310,12 @@ Each slot some sync committee members in each subcommittee are selected to aggre
 
 ##### Aggregation selection
 
-A validator is selected to aggregate based on the computation in `is_sync_committee_aggregator` where `state` is a `BeaconState` as supplied to `get_sync_committee_slot_signature` and `signature` is the BLS signature returned by `get_sync_committee_slot_signature`. 
+A validator is selected to aggregate based on the computation in `is_sync_committee_aggregator` where `state` is a `BeaconState` as supplied to `get_sync_committee_selection_proof` and `signature` is the BLS signature returned by `get_sync_committee_selection_proof`. 
 The signature function takes a `BeaconState` with the relevant sync committees for the queried `slot` (i.e. `state.slot` is within the span covered by the current or next sync committee period), the `subcommittee_index` equal to the `subnet_id`, and the `privkey` is the BLS private key associated with the validator.
 
 ```python
-def get_sync_committee_slot_signature(state: BeaconState, slot: Slot,
-                                      subcommittee_index: uint64, privkey: int) -> BLSSignature:
+def get_sync_committee_selection_proof(state: BeaconState, slot: Slot,
+                                       subcommittee_index: uint64, privkey: int) -> BLSSignature:
     domain = get_domain(state, DOMAIN_SYNC_COMMITTEE_SELECTION_PROOF, compute_epoch_at_slot(slot))
     signing_data = SyncCommitteeSigningData(
         slot=slot,
@@ -378,7 +378,7 @@ def get_contribution_and_proof(state: BeaconState,
                                aggregator_index: ValidatorIndex,
                                contribution: SyncCommitteeContribution,
                                privkey: int) -> ContributionAndProof:
-    selection_proof = get_sync_committee_slot_signature(
+    selection_proof = get_sync_committee_selection_proof(
         state,
         contribution.slot,
         contribution.subcommittee_index,