no swarm ID in sync

1 files changed, 2 insertions, 1 deletions

diff --git a/docs/peers.md b/docs/peers.md
index 0f7635e..e86e530 100644
--- a/docs/peers.md
+++ b/docs/peers.md
@@ -78,7 +78,8 @@ sequenceDiagram
 ```
 
 One round trip makes both sides members of each other: the HELLO proves the sender's
-key, the reply the swarm ID and the responder's key. A new handshake resets the sync
+key, the reply the swarm ID and the responder's key. Sync messages don't repeat the
+swarm ID: the handshake bound the peer to it. A new handshake resets the sync
 session on both sides; HELLOs carry the handshake's number, so a resent HELLO (its
 reply was lost) or a late copy is answered without resetting again. A node that doesn't know its swarm
 yet (it is joining itself) doesn't answer a HELLO; the sender retries.