diff --git a/specs/phase0/fork-choice.md b/specs/phase0/fork-choice.md
index a4d6b6cfa..ad1dc540c 100644
--- a/specs/phase0/fork-choice.md
+++ b/specs/phase0/fork-choice.md
@@ -371,14 +371,15 @@ def on_block(store: Store, signed_block: SignedBeaconBlock) -> None:
     # Update finalized checkpoint
     if state.finalized_checkpoint.epoch > store.finalized_checkpoint.epoch:
         store.finalized_checkpoint = state.finalized_checkpoint
-        
+
         if store.justified_checkpoint != state.current_justified_checkpoint:
             finalized_slot = compute_start_slot_at_epoch(store.finalized_checkpoint.epoch)
             # Update justified if new justified is later than store justified
             # or if store justified is not in chain with finalized checkpoint
             if (
                 state.current_justified_checkpoint.epoch > store.justified_checkpoint.epoch
-                or get_ancestor(store, store.justified_checkpoint.root, finalized_slot) != store.finalized_checkpoint.root
+                or get_ancestor(
+                    store, store.justified_checkpoint.root, finalized_slot) != store.finalized_checkpoint.root
             ):
                 store.justified_checkpoint = state.current_justified_checkpoint
 ```