diff --git a/specs/core/0_beacon-chain.md b/specs/core/0_beacon-chain.md
index 1032a905a..fa0c97acb 100644
--- a/specs/core/0_beacon-chain.md
+++ b/specs/core/0_beacon-chain.md
@@ -1761,13 +1761,12 @@ def get_previous_epoch_matching_head_attestations(state: BeaconState) -> List[Pe
 
 ```python
 def get_winning_root_and_participants(state: BeaconState, slot: Slot, shard: Shard) -> Tuple[Bytes32, List[ValidatorIndex]]:
-    all_attestations = state.current_epoch_attestations + state.previous_epoch_attestations
+    attestations = state.current_epoch_attestations if slot_to_epoch(slot) == get_current_epoch(state) else state.previous_epoch_attestations
     crosslinks = state.current_crosslinks if slot_to_epoch(slot) == get_current_epoch(state) else state.previous_crosslinks
 
     valid_attestations = [
-        a for a in all_attestations
-        if a.data.previous_crosslink == crosslinks[shard] and
-        a.data.shard == shard and a.data.slot == slot
+        a for a in attestations
+        if a.data.previous_crosslink == crosslinks[shard] and a.data.shard == shard
     ]
     all_roots = [a.data.crosslink_data_root for a in valid_attestations]