diff --git a/hand_control/launch/ardrone.launch b/hand_control/launch/ardrone.launch
index 40d898c..5a56cc2 100644
--- a/hand_control/launch/ardrone.launch
+++ b/hand_control/launch/ardrone.launch
@@ -8,8 +8,9 @@
     <param name="max_bitrate" value="4000" />
     <param name="bitrate" value="4000" />
 
-    <!-- 0 : drone sends a reduced set
+    <!-- 0 : 15Hz, drone sends a reduced set
     of navigation data (without debugging info) -->
+    <!-- 1 : 200Hz -->
     <param name="navdata_demo" value="0" />
 
     <param name="flight_without_shell" value="0" />