diff --git a/launch/roswww.launch b/launch/roswww.launch
index 5894e4d..6805e07 100644
--- a/launch/roswww.launch
+++ b/launch/roswww.launch
@@ -4,6 +4,9 @@
   <arg name="cached" default="true"/>
   <arg name="single_package" default=""/>
   <arg name="basic" default="false"/>
+  <arg name="basic_yaml" default=""/>
+  <arg name="basic_flag" value="--basic $(arg basic) --basic-yaml $(arg basic_yaml)" if="$(arg basic)" />
+  <arg name="basic_flag" value="" unless="$(arg basic)" />
 
   <arg name="port" default="8085"/>
   <arg name="start_port" default="$(arg port)" />
@@ -11,7 +14,7 @@
 
   <node pkg="roswww" type="webserver.py" name="$(arg name)"
         args="--name $(arg name) --webpath $(arg webpath) --cached $(arg cached)
-              --basic $(arg basic)
+              $(arg basic_flag)
               --single_package=$(arg single_package)
               --port $(arg port) --start_port $(arg start_port) --end_port $(arg end_port)" />
 </launch>