diff --git a/validator_client/src/lib.rs b/validator_client/src/lib.rs
index ec7a084f55..5dccda20f0 100644
--- a/validator_client/src/lib.rs
+++ b/validator_client/src/lib.rs
@@ -60,13 +60,13 @@ const WAITING_FOR_GENESIS_POLL_TIME: Duration = Duration::from_secs(12);
 const HTTP_ATTESTATION_TIMEOUT_QUOTIENT: u32 = 4;
 const HTTP_ATTESTER_DUTIES_TIMEOUT_QUOTIENT: u32 = 4;
 const HTTP_ATTESTATION_SUBSCRIPTIONS_TIMEOUT_QUOTIENT: u32 = 24;
-const HTTP_ATTESTATION_AGGREGATOR_TIMEOUT_QUOTIENT: u32 = 24; // For distributed mode only
+const HTTP_ATTESTATION_AGGREGATOR_TIMEOUT_QUOTIENT: u32 = 24; // For DVT involving middleware only
 const HTTP_LIVENESS_TIMEOUT_QUOTIENT: u32 = 4;
 const HTTP_PROPOSAL_TIMEOUT_QUOTIENT: u32 = 2;
 const HTTP_PROPOSER_DUTIES_TIMEOUT_QUOTIENT: u32 = 4;
 const HTTP_SYNC_COMMITTEE_CONTRIBUTION_TIMEOUT_QUOTIENT: u32 = 4;
 const HTTP_SYNC_DUTIES_TIMEOUT_QUOTIENT: u32 = 4;
-const HTTP_SYNC_AGGREGATOR_TIMEOUT_QUOTIENT: u32 = 24; // For distributed mode only
+const HTTP_SYNC_AGGREGATOR_TIMEOUT_QUOTIENT: u32 = 24; // For DVT involving middleware only
 const HTTP_GET_BEACON_BLOCK_SSZ_TIMEOUT_QUOTIENT: u32 = 4;
 const HTTP_GET_DEBUG_BEACON_STATE_QUOTIENT: u32 = 4;
 const HTTP_GET_DEPOSIT_SNAPSHOT_QUOTIENT: u32 = 4;
@@ -83,12 +83,12 @@ const SELECTION_PROOF_SLOT_LOOKAHEAD: u64 = 8;
 /// The attestation selection proof lookahead for those running with the --distributed flag.
 const SELECTION_PROOF_SLOT_LOOKAHEAD_DVT: u64 = 1;
 
-/// Fraction of a slot at which selection proof signing should happen (2 means half way).
+/// Fraction of a slot at which attestation selection proof signing should happen (2 means half way).
 const SELECTION_PROOF_SCHEDULE_DENOM: u32 = 2;
 
-/// Number of epochs in advance to compute selection proofs when not in `distributed` mode.
+/// Number of epochs in advance to compute sync selection proofs when not in `distributed` mode.
 pub const AGGREGATION_PRE_COMPUTE_EPOCHS: u64 = 2;
-/// Number of slots in advance to compute selection proofs when in `distributed` mode.
+/// Number of slots in advance to compute sync selection proofs when in `distributed` mode.
 pub const AGGREGATION_PRE_COMPUTE_SLOTS_DISTRIBUTED: u64 = 1;
 
 type ValidatorStore<E> = LighthouseValidatorStore<SystemTimeSlotClock, E>;
@@ -499,9 +499,7 @@ impl<E: EthSpec> ProductionValidatorClient<E> {
             }
         };
 
-        let duties_service: Arc<
-            DutiesService<LighthouseValidatorStore<SystemTimeSlotClock, E>, SystemTimeSlotClock>,
-        > = Arc::new(
+        let duties_service = Arc::new(
             DutiesServiceBuilder::new()
                 .slot_clock(slot_clock.clone())
                 .beacon_nodes(beacon_nodes.clone())
diff --git a/validator_client/validator_services/src/duties_service.rs b/validator_client/validator_services/src/duties_service.rs
index cff3426cb7..34607eaa13 100644
--- a/validator_client/validator_services/src/duties_service.rs
+++ b/validator_client/validator_services/src/duties_service.rs
@@ -118,11 +118,12 @@ pub struct SubscriptionSlots {
 pub struct SelectionProofConfig {
     pub lookahead_slot: u64,
     pub computation_offset: Duration, // The seconds to compute the selection proof before a slot
-    pub selections_endpoint: bool,
-    pub parallel_sign: bool,
+    pub selections_endpoint: bool, // whether to call the selections endpoint, true for DVT with middleware
+    pub parallel_sign: bool, // whether to sign the selection proof in parallel, true in distributed mode
 }
 
 impl SelectionProofConfig {
+    // Create a default associated function to be passed in DutiesServiceBuilder::new()
     fn default() -> Self {
         Self {
             lookahead_slot: 0,
@@ -136,7 +137,7 @@ impl SelectionProofConfig {
 /// Create a selection proof for `duty`.
 ///
 /// Return `Ok(None)` if the attesting validator is not an aggregator.
-async fn make_selection_proof<S: ValidatorStore + 'static, T: SlotClock + 'static>(
+async fn make_selection_proof<S: ValidatorStore + 'static, T: SlotClock>(
     duty: &AttesterData,
     validator_store: &S,
     spec: &ChainSpec,
@@ -147,7 +148,7 @@ async fn make_selection_proof<S: ValidatorStore + 'static, T: SlotClock + 'stati
         let beacon_committee_selection = BeaconCommitteeSelection {
             validator_index: duty.validator_index,
             slot: duty.slot,
-            // In distributed mode, this is partial selection proof
+            // This is partial selection proof
             selection_proof: validator_store
                 .produce_selection_proof(duty.pubkey, duty.slot)
                 .await
@@ -183,6 +184,7 @@ async fn make_selection_proof<S: ValidatorStore + 'static, T: SlotClock + 'stati
         debug!(
             "validator_index" = response_data.validator_index,
             "slot" = %response_data.slot,
+            // The selection proof from middleware response will be a full selection proof
             "full selection proof" = ?response_data.selection_proof,
             "Received selection from middleware"
         );
@@ -277,8 +279,9 @@ pub struct DutiesServiceBuilder<S, T> {
     spec: Option<Arc<ChainSpec>>,
     //// Whether we permit large validator counts in the metrics.
     enable_high_validator_count_metrics: bool,
-    /// If this validator is running in distributed mode.
+    /// Create attestation selection proof config
     attestation_selection_proof_config: SelectionProofConfig,
+    /// Create sync selection proof config
     sync_selection_proof_config: SelectionProofConfig,
     disable_attesting: bool,
 }
diff --git a/validator_client/validator_services/src/sync.rs b/validator_client/validator_services/src/sync.rs
index d2a1aabc5b..cdda9a6690 100644
--- a/validator_client/validator_services/src/sync.rs
+++ b/validator_client/validator_services/src/sync.rs
@@ -487,7 +487,7 @@ pub async fn poll_sync_committee_duties_for_period<S: ValidatorStore, T: SlotClo
 }
 
 // Create a helper function here to reduce code duplication for normal and distributed mode
-pub async fn make_sync_selection_proof<S: ValidatorStore, T: SlotClock + 'static>(
+pub async fn make_sync_selection_proof<S: ValidatorStore, T: SlotClock>(
     duties_service: &Arc<DutiesService<S, T>>,
     duty: &SyncDuty,
     proof_slot: Slot,
@@ -519,7 +519,7 @@ pub async fn make_sync_selection_proof<S: ValidatorStore, T: SlotClock + 'static
         }
     };
 
-    // In distributed mode when we want to call the selections endpoint
+    // In DVT with middleware, when we want to call the selections endpoint
     if duties_service
         .sync_duties
         .selection_proof_config
@@ -529,7 +529,7 @@ pub async fn make_sync_selection_proof<S: ValidatorStore, T: SlotClock + 'static
             "validator_index" = duty.validator_index,
             "slot" = %proof_slot,
             "subcommittee_index" = *subnet_id,
-            // In distributed mode, this is partial selection proof
+            // This is partial selection proof
             "partial selection proof" = ?Signature::from(selection_proof.clone()),
             "Sending sync selection to middleware"
         );