diff --git a/copter/source/docs/systemid-mode-operation.rst b/copter/source/docs/systemid-mode-operation.rst
index 9146bad5a3..0ce1ece389 100644
--- a/copter/source/docs/systemid-mode-operation.rst
+++ b/copter/source/docs/systemid-mode-operation.rst
@@ -63,7 +63,26 @@ The IMU chosen for this log is the same IMU used to generate the attitude predic
 Parameters
 ==========
 
-:ref:`SID_AXIS<SID_AXIS>`: Controls which axis and control loop injection point are being excited
+:ref:`SID_AXIS<SID_AXIS>`: Controls which axis and control loop injection point are being excited:
+
+=====    ===========
+Value    Description
+=====    ===========
+0        None (prevents entry into mode and display of other mode parameters)
+1        Input Roll Angle
+2        Input Pitch Angle
+3        Input Yaw Angle
+4        Recovery Roll Angle,
+5        Recovery Pitch Angle
+6        Recovery Yaw Angle
+7        Rate Roll
+8        Rate Pitch
+9        Rate Yaw
+10       Mixer Roll,
+11       Mixer Pitch
+12       Mixer Yaw
+13       Mixer Thrust
+=====    ===========
 
 :ref:`SID_MAGNITUDE<SID_MAGNITUDE>`: System identification Chirp Magnitude. Depending on the injection point, units will be in either deg, deg/s, or 0-1 for mixer outputs. The magnitude can be changed in flight easily using the :ref:`tuning knob<TUNE>` using the 58 option.