diff --git a/readme.txt b/readme.txt
index b79ac9f0bcf5a3464b24ee190148da7aaebd5893..6623e52da90f9345c44c94ef4b11075173fd3947 100644
--- a/readme.txt
+++ b/readme.txt
@@ -568,6 +568,17 @@ columns are the Euler angles yaw, pitch, and roll. The rotations are applied in
 The yaw angle rotates around the z axis, the pitch angle rotates aroud the new y axis, and the roll angle 
 rotates around the new x axis.
 
+In case of 6 DoF support for rendering, the head rotation trajectory file may also include a listener 
+position in absolute Cartesian coordinates on the x-, y- and z-axis. Note that the listener position is 
+expressed in absolute coordinates, while the listener orientation is expressed as scene displacement. 
+An example line from a headtracking file of a listener facing forward, positioned at x=3.0, y=4.0 and z=0, 
+could be:
+
+-3.0,0.0,0.0,0.0,3.0,4.0,0.0
+
+Note that the listener position applies for listener orientation expressed both in Quaternions and Euler angles.
+
+
 For the Head rotation operation modes, external trajectory files are available:
 
 headrot.csv