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diff --git a/doc/spec/dir-spec.txt b/doc/spec/dir-spec.txt
index b383cdf403..e2ad056d47 100644
--- a/doc/spec/dir-spec.txt
+++ b/doc/spec/dir-spec.txt
@@ -1168,6 +1168,15 @@
and 0.2.2.10-alpha recognized a "CircPriorityHalflifeMsec" parameter,
but mishandled it badly.)
+ "perconnbwrate" and "perconnbwburst" -- if set, each relay sets
+ up a separate token bucket for every client OR connection,
+ and rate limits that connection indepedently. Typically left
+ unset, except when used for performance experiments around trac
+ entry 1750. Only honored by relays running Tor 0.2.2.16-alpha
+ and later. (Note that relays running 0.2.2.7-alpha through
+ 0.2.2.14-alpha looked for bwconnrate and bwconnburst, but then
+ did the wrong thing with them; see bug 1830 for details.)
+
See also "2.4.5. Consensus parameters governing behavior"
in path-spec.txt for a series of circuit build time related
consensus params.