diff --git a/greenload/__init__.py b/greenload/__init__.py
index 7f2c2f9..64c673c 100755
--- a/greenload/__init__.py
+++ b/greenload/__init__.py
@@ -343,7 +343,7 @@ def make_exvars(ex):
 
 
 def make_parser():
-    parser = OptionParser(usage="%prog [options] config.yml")
+    parser = OptionParser(usage="%prog [options] config.yml ...")
     parser.add_option('-f', '--fork', type='int')
     parser.add_option('-c', '--max-request', type='int')
     parser.add_option('-n', '--loop', type='int')
@@ -435,7 +435,9 @@ def main():
         parser.print_help()
         return
 
-    conf = load_conf(args[0])
+    conf = {}
+    for arg in args:
+        conf.update(load_conf(arg))
     update_conf(conf, opts)
 
     loglevel = conf.get("log_level", 3)