diff --git a/iwla.py b/iwla.py
index 81571be..42f5f2c 100755
--- a/iwla.py
+++ b/iwla.py
@@ -623,6 +623,9 @@ if __name__ == '__main__':
                         default=False,
                         help='Read data from stdin instead of conf.analyzed_filename')
 
+    parser.add_argument('-f', '--file', dest='file',
+                        help='Analyse this log file')
+
     args = parser.parse_args()
 
     if args.clean_output:
@@ -638,8 +641,9 @@ if __name__ == '__main__':
     if args.stdin:
         iwla.start(sys.stdin)
     else:
-        if not os.path.exists(conf.analyzed_filename):
-            print 'No such file \'%s\'' % (conf.analyzed_filename)
+        filename = args.file or conf.analyzed_filename
+        if not os.path.exists(filename):
+            print 'No such file \'%s\'' % (filename)
             sys.exit(-1)
-        with open(conf.analyzed_filename) as f:
+        with open(filename) as f:
             iwla.start(f)