diff --git a/INSTALL b/INSTALL
index 8d74078..9ee4df6 100644
--- a/INSTALL
+++ b/INSTALL
@@ -1,90 +1,92 @@
 
 SylkServer Installation
 -----------------------
 
 Copyright (c) AG Projects
 http://ag-projects.com
 
 Home page: http://sylkserver.com
 
 Ths software can be installed manually from it source tree or as a Debian
 package on Debian and Ubuntu systems.
 
 
 Debian and Ubuntu packages
 --------------------------
 
 Install the AG Projects debian software signing key:
 
 wget http://download.ag-projects.com/agp-debian-gpg.key
 sudo apt-key add agp-debian-gpg.key
 
 Add these repository matching your distribution to /etc/apt/sources.list:
 
 http://projects.ag-projects.com/projects/documentation/wiki/Repositories
 
 Update the list of available packages:
 
 sudo apt-get update
 
 Install SylkServer:
 
 sudo apt-get install sylkserver
 
 Enable SylkServer:
 
 Edit /etc/default/sylkserver and set RUN_SYLKSERVER=yes
 
 Configure SylkServer:
 
 Edit /etc/sylkserver/config.ini
 
 Run SylkServer:
 
 /etc/init.d/sylkserver start
 
 High level application logs are logged to syslog.
 
 Detail protocol traces are logged in /var/log/sylkserver/
 
 
 Manual installation
 -------------------
 
 The source code is managed using darcs version control tool. The darcs
 repository can be fetched with:
 
 darcs get http://devel.ag-projects.com/repositories/sylkserver
 
 To obtain the incremental changes after the initial get run:
 
 darcs pull -a
 
 Install the required dependencies:
 
  * python-sipsimple http://sipsimpleclient.org
  * python-application (>= 2.8.0)
  * python-autobahn
  * python-eventlib
  * python-lxml
  * python-klein
  * python-twisted
  * python-typing
  * python-werkzeug
 
 Optionally, install the following packages for extra functionality:
 
  * python-wokkel http://wokkel.ik.nu/
 
 To run SylkServer in the foreground:
 
 ./sylk-server --no-fork
 
 To run SylkServer in the foreground in bonjour mode:
 
 ./sylk-server --no-fork --use-bonjour
 
+To toggle debug mode send SIGUSR1 signal to the sylk-server process.
+
 To install SylkServer manually system wide:
 
 sudo python setup.py install