1 files changed, 4 insertions, 3 deletions
diff --git a/src/state/host.rs b/src/state/host.rs
index 3210ee2..38be831 100644
--- a/src/state/host.rs
+++ b/src/state/host.rs
@@ -24,9 +24,10 @@ impl AppState {
     /// document. (Lock order doc -> peer, as in sync generation.)
     fn swap_document(&self, replica: &mut Replica, epoch: Epoch, doc: Document) -> Document {
         let old = std::mem::replace(&mut replica.doc, doc);
-        // The old document's signatures are of its changes; this node's replayed into
-        // the new one, signed at once.
-        replica.signatures = Default::default();
+        // The old document's signatures, of the changes the new one holds too (it may
+        // be the old one without some, or another of its epoch); this node's replayed
+        // into it, signed at once.
+        replica.signatures = replica.signatures.kept_for(&replica.doc);
         if let Some(key) = &self.node_key {
             let replica = &mut *replica;
             replica.signatures.sign_own_latest(&replica.doc, key);