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-rw-r--r--address-spec.txt13
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diff --git a/address-spec.txt b/address-spec.txt
index ce6d2b6..2b361d1 100644
--- a/address-spec.txt
+++ b/address-spec.txt
@@ -56,3 +56,16 @@
When Tor sees an address in this format, it tries to look up and connect to
the specified hidden service. See rend-spec.txt for full details.
+4. .noconnect
+
+ SYNTAX: [string].noconnect
+
+ When Tor sees an address in this format, it immediately closes the
+ connection without attaching it to any circuit. This is useful for
+ controllers that want to test whether a given application is indeed
+ using the same instance of Tor that they're controlling.
+
+ This feature was added in Tor 0.1.2.4-alpha, and taken out in Tor
+ 0.2.2.1-alpha over fears that it provided another avenue for detecting
+ Tor users via application-level web tricks.
+