1 files changed, 9 insertions, 0 deletions
diff --git a/src/transport/mod.rs b/src/transport/mod.rs
index e0359b0..640754a 100644
--- a/src/transport/mod.rs
+++ b/src/transport/mod.rs
@@ -576,6 +576,10 @@ pub(crate) struct HelloRequest {
     /// with all peers, from 1. A retry carries the same number, so the recipient resets
     /// its sync session only for a new handshake, not for every resend or late copy.
     pub(crate) handshake: u32,
+    /// The hash of its epoch's root, where its document holds it (`swarm::roots`): what
+    /// a joining node takes as the root, where those it hears agree.
+    #[serde(with = "serde_bytes")]
+    pub(crate) root: Option<Vec<u8>>,
 }
 
 /// A peer a HELLO_REPLY lists: who it is, and where the sender reaches it.
@@ -661,6 +665,9 @@ pub(crate) struct HelloReply {
     /// The sender's own run (as its HELLOs carry it): a new one means it restarted.
     #[serde(with = "crate::transport::wire::codec::run_id")]
     pub(crate) sender_run_id: RunId,
+    /// As `HelloRequest::root`.
+    #[serde(with = "serde_bytes")]
+    pub(crate) root: Option<Vec<u8>>,
 }
 
 /// Bytes shown as lowercase hex, e.g. run IDs in logs.
@@ -694,6 +701,7 @@ impl std::fmt::Debug for HelloRequest {
             .field("ready", &self.ready)
             .field("run_id", &Hex(&self.run_id))
             .field("handshake", &self.handshake)
+            .field("root", &self.root.as_deref().map(Hex))
             .finish()
     }
 }
@@ -710,6 +718,7 @@ impl std::fmt::Debug for HelloReply {
             .field("run_id", &Hex(&self.run_id))
             .field("away_ms", &self.away_ms)
             .field("sender_run_id", &Hex(&self.sender_run_id))
+            .field("root", &self.root.as_deref().map(Hex))
             .finish()
     }
 }