Add backoff reset spec to the Connection Backoff Protocol
diff --git a/doc/connection-backoff.md b/doc/connection-backoff.md
index 7094e73..251a60f 100644
--- a/doc/connection-backoff.md
+++ b/doc/connection-backoff.md
@@ -44,3 +44,12 @@
Alternate implementations must ensure that connection backoffs started at the
same time disperse, and must not attempt connections substantially more often
than the above algorithm.
+
+## Reset Backoff
+
+The back off should be reset to INITIAL_BACKOFF at some time point, so that the
+reconnecting behavior is consistent no matter the connection is a newly started
+one or a previously disconnected one.
+
+We choose to reset the Backoff when the SETTINGS frame is received, at that time
+point, we know for sure that this connection was accepted by the server.