Explain TransportProxy within doc/state-contents.txt.

diff --git a/doc/state-contents.txt b/doc/state-contents.txt
index 730e2fbcc27be44e453a0378c29455ad7e24cd63..44716efc0cd8ff39e49765914cee23140564f7a7 100644 (file)
--- a/doc/state-contents.txt
+++ b/doc/state-contents.txt
@@ -60,10 +60,10 @@ Recognized fields are:
 
      One or more of these may be present.
 
-     The format is "transportname addr:port", to remember the address at
-     which a pluggable transport was listening.
-
-     [XXXX why?]
+     The format is "transportname addr:port", to remember the address
+     at which a pluggable transport was listening. Tor bridges use
+     this information to spawn pluggable transport listeners in the
+     same IP address and TCP port even after tor client restarts.
 
   BWHistoryReadEnds           (ISO time)
   BWHistoryReadInterval       (integer, number of seconds)