diff --git a/src/centpkg/__main__.py b/src/centpkg/__main__.py
index c696c69..de61b8c 100644
--- a/src/centpkg/__main__.py
+++ b/src/centpkg/__main__.py
@@ -30,6 +30,7 @@ def main():
 
     """
     program_name = os.path.basename(sys.argv[0])
+    is_sig = program_name.endswith('-sig')
 
     default_user_config_path = os.path.join(
         os.path.expanduser('~'), '.config', 'rpkg', '%s.conf' % program_name)
@@ -45,6 +46,10 @@ def main():
                         default='/etc/rpkg/%s.conf' % program_name)
     parser.add_argument('--user-config', help='Specify a user config file to use',
                         default=default_user_config_path)
+    parser.add_argument('--lookaside-structure',
+                        help='set the lookaside cache structure type use',
+                        choices=['branch', 'hash'],
+                        default='hash')
 
     (args, other) = parser.parse_known_args()
 
@@ -57,9 +62,12 @@ def main():
     config = ConfigParser.SafeConfigParser()
     config.read(args.config)
     config.read(args.user_config)
+    if is_sig:
+        config[program_name]['lookaside_structure'] = args.lookaside_structure
 
-    client = centpkg.cli.centpkgClient(config, name=program_name)
+    client = centpkg.cli.centpkgClient(config, name=program_name)    
     client.do_imports(site='centpkg')
+    client.update_argparser(is_sig=is_sig)
     client.parse_cmdline()
 
     # This is due to a difference argparse behavior to Python 2 version.
diff --git a/src/centpkg/cli.py b/src/centpkg/cli.py
index faebb0d..d01b969 100755
--- a/src/centpkg/cli.py
+++ b/src/centpkg/cli.py
@@ -35,6 +35,13 @@ class centpkgClient(cliClient):
 
         self.setup_centos_subparsers()
 
+    def update_argparser(self, is_sig=False):
+        if is_sig:
+            self.parser.add_argument('--lookaside-structure',
+                                    help='set the lookaside cache structure type use',
+                                    choices=['branch', 'hash'],
+                                    default='hash')
+
     def load_cmd(self):
         super(centpkgClient, self).load_cmd()
         cfg = self.config[self.get_name()]