diff --git a/adns_server.py b/adns_server.py
index dc17632..ad90481 100755
--- a/adns_server.py
+++ b/adns_server.py
@@ -125,6 +125,7 @@ def usage(msg=None):
        -f:        Remain attached to foreground (default don't)
        -e N:      Max EDNS bufsize in octets for responses we send out.
                   (-e 0 will disable EDNS support)
+       -x file:   Name of file to write the PID      
 
 Note: a configuration file that minimally specifies the zones to load
 must be present.
@@ -213,7 +214,7 @@ def process_args(prefs, zonedict, arguments):
     """Process all command line arguments"""
 
     try:
-        (options, args) = getopt.getopt(arguments, 'hc:dp:s:z:u:g:46fe:')
+        (options, args) = getopt.getopt(arguments, 'hc:dp:s:z:u:g:46fe:x:')
     except getopt.GetoptError as error_info:
         usage(str(error_info))
 
@@ -250,6 +251,8 @@ def process_args(prefs, zonedict, arguments):
             prefs.daemon = False
         elif opt == "-e":
             prefs.edns_udp_max = int(optval)
+        elif opt == "-x":
+            prefs.pidfile = optval
 
 
 def log_message(msg):