diff --git a/specs/merge/fork.md b/specs/merge/fork.md
index 5c5c40a64..c89e00cf9 100644
--- a/specs/merge/fork.md
+++ b/specs/merge/fork.md
@@ -91,6 +91,9 @@ def upgrade_to_merge(pre: altair.BeaconState) -> BeaconState:
         finalized_checkpoint=pre.finalized_checkpoint,
         # Inactivity
         inactivity_scores=pre.inactivity_scores,
+        # Sync
+        current_sync_committee=pre.current_sync_committee,
+        next_sync_committee=pre.next_sync_committee,
         # Execution-layer
         latest_execution_payload_header=ExecutionPayloadHeader(),
     )