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-rw-r--r--docs/peers.md3
1 files changed, 2 insertions, 1 deletions
diff --git a/docs/peers.md b/docs/peers.md
index d22fef6..4775e85 100644
--- a/docs/peers.md
+++ b/docs/peers.md
@@ -170,7 +170,8 @@ recent remake, or a return after much was written, gets the bulk of its changes.
downloads one delta at a time: while a large one comes, it lacks those changes, so its
other neighbours offer them too, and they would come once per offer. Offers that come
meanwhile wait; once the delta is in, the node syncs with those that offered, which then
-send only what is still missing.
+send only what is still missing. What a delta brought counts as known to its sender, as
+what its sync messages bring does: none of it goes back, by message or as a delta.
Towards a peer on a slow link the limit is lower: a message is offered as a delta if it
would take more than 5 s at the throughput measured to that peer (`syncThroughput`,