Modify msg file

edit

HI , I try to modify an msg file ( add new field) : this my code

float64[3] hand_direction
float64[3] hand_normal
float64[3] hand_translation /: this is the new field 
float64[3] hand_palm_pos
float64 hand_pitch
float64 hand_roll
float64 hand_yaw

When i type $ rosmsg show leapros.msg i get the old content

std_msgs/Header header
  uint32 seq
  time stamp
  string frame_id
geometry_msgs/Vector3 direction
  float64 x
  float64 y
  float64 z
geometry_msgs/Vector3 normal
  float64 x
  float64 y
  float64 z
geometry_msgs/Point palmpos
  float64 x
  float64 y
  float64 z
geometry_msgs/Vector3 ypr
  float64 x
  float64 y
  float64 z

why i can't modify the msg file content ??