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-rw-r--r--spec/control-spec/replies.md8
1 files changed, 5 insertions, 3 deletions
diff --git a/spec/control-spec/replies.md b/spec/control-spec/replies.md
index 6fce9b1..ed76cbd 100644
--- a/spec/control-spec/replies.md
+++ b/spec/control-spec/replies.md
@@ -1445,9 +1445,11 @@ dropped cells, and ignored cells (such as padding cells). These
values include the relay headers, but not circuit headers.
Circuit data that has been validated and processed by Tor is further
-broken down into two categories: delivered payloads and overhead.
-DeliveredBytesRead and DeliveredBytesWritten are the total relay cell
-payloads transmitted since the last CIRC_BW event, not counting relay
+broken down into two categories: delivered relay message bodies,
+and overhead.
+DeliveredBytesRead and DeliveredBytesWritten are the total
+length of the relay message bodies
+transmitted since the last CIRC_BW event, not counting relay
cell headers or circuit headers. OverheadBytesRead and
OverheadBytesWritten are the extra unused bytes at the end of each
cell in order for it to be the fixed CELL_LEN bytes long.