doc: update docs for Tor listening

- add new data directory files for 0.12 to doc/files.md
- mention torcontrol in doc/tor.md

1 files changed, 17 insertions, 0 deletions

diff --git a/doc/tor.md b/doc/tor.md
index 594897f896..1d35a658bc 100644
--- a/doc/tor.md
+++ b/doc/tor.md
@@ -87,3 +87,20 @@ If you only want to use Tor to reach onion addresses, but not use it as a proxy
 for normal IPv4/IPv6 communication, use:
 
 	./bitcoin -onion=127.0.0.1:9050 -externalip=57qr3yd1nyntf5k.onion -discover
+
+3. Automatically listen on Tor
+--------------------------------
+
+Starting with Tor version 0.2.7.1 it is possible, through Tor's control socket
+API, to create and destroy 'ephemeral' hidden services programmatically.
+Bitcoin Core has been updated to make use of this.
+
+This means that if Tor is running (and proper authorization is available),
+Bitcoin Core automatically creates a hidden service to listen on, without
+manual configuration. This will positively affect the number of available
+.onion nodes.
+
+This new feature is enabled by default if Bitcoin Core is listening, and
+a connection to Tor can be made. It can be configured with the `-listenonion`,
+`-torcontrol` and `-torpassword` settings. To show verbose debugging
+information, pass `-debug=tor`.