diff --git a/specs/beacon-chain.md b/specs/beacon-chain.md
index d4fe05a8c..a4ce066da 100644
--- a/specs/beacon-chain.md
+++ b/specs/beacon-chain.md
@@ -492,6 +492,7 @@ def on_startup(initial_validator_entries: List[Any]) -> Tuple[CrystallizedState,
         for i in range(SHARD_COUNT)
     ]
     crystallized_state = CrystallizedState(
+        validator_set_change_slot=0,
         validators=validators,
         crosslinks=crosslinks,
         last_state_recalculation_slot=0,