Some docstrings.

diff --git a/discovery.py b/discovery.py
index d20386e..6206af3 100644
--- a/discovery.py
+++ b/discovery.py
@@ -22,11 +22,6 @@ servicenames = {'_ssh._tcp':  'ssh',
                 '_pulse-server._tcp':  'pulseaudio',
                 '_nameserver._udp': 'dns'}

-def on_sigint(signum, frame):
-    print "Got SIGINT"
-    sys.exit()
-
-
 class Browser(threading.Thread):
     def __init__(self,group=None,target=None,name=None,args=(), kwargs=None,verbose=None):
         threading.Thread.__init__(self)
@@ -112,6 +107,8 @@ class ZeroconfListener(object):
 #         print "services[%s] = %s" % (sname, svc)

 def discover(services=('_ssh._tcp','_workstation._tcp','_nameserver._udp'),timeout=None):
+    """Discover services of given types via zeroconf.
+    Returns (blocked) lock, which is released when all services are discovered."""
     global browser
     lock = threading.Lock()
     lock.acquire()
@@ -124,5 +121,6 @@ def discover(services=('_ssh._tcp','_workstation._tcp','_nameserver._udp'),timeo
     return lock

 def stop():
+    "Cancel discovery"
     global browser
     browser.quit()
diff --git a/test.py b/test.py
index d409b92..cdd8a40 100755
--- a/test.py
+++ b/test.py
@@ -57,6 +57,7 @@ machine.hostname = 'portnov'

 templates.services = discovery.services
 templates.machine = machine
+
 print "Waiting for discovery..."
 lock.acquire()