diff --git a/specs/lightclient/beacon-chain.md b/specs/lightclient/beacon-chain.md
index 2fbe190e4..8f0c514f0 100644
--- a/specs/lightclient/beacon-chain.md
+++ b/specs/lightclient/beacon-chain.md
@@ -130,7 +130,8 @@ def eth2_fast_aggregate_verify(pubkeys: Sequence[BLSPubkey], message: Bytes32, s
 def get_sync_committee_indices(state: BeaconState, epoch: Epoch) -> Sequence[ValidatorIndex]:
     """
     Return the sync committee indices for a given state and epoch.
-    """ 
+    Note that there may be duplicate indices in the resulting list.
+    """
     MAX_RANDOM_BYTE = 2**8 - 1
     base_epoch = Epoch((max(epoch // EPOCHS_PER_SYNC_COMMITTEE_PERIOD, 1) - 1) * EPOCHS_PER_SYNC_COMMITTEE_PERIOD)
     active_validator_indices = get_active_validator_indices(state, base_epoch)