diff --git a/tools/fgm3d_adapter.py b/tools/fgm3d_adapter.py
index b76f933..1357484 100644
--- a/tools/fgm3d_adapter.py
+++ b/tools/fgm3d_adapter.py
@@ -4,9 +4,12 @@ from datetime import datetime
 import socket
 
 # Lookup table for cage axis to magnetometer transformation
-# First entry: Magnetometer y axis to cage x (reversed)
-# axis_mapping = [[1, -1 ...]
-axis_mapping = [[2, -1], [0, 1], [1, -1]]
+# First entry: Magnetometer z axis to cage x (reversed) [1,1]
+# axis_mapping = [[corresponding axis (0=x,1=y,2=z), direction (+-1) ...]
+# axis_mapping = [[2, -1], [0, 1], [1, -1]] # Z_MGM = -X_HH, X_MGM = +Y_HH, Y_MGM = -Z_HH,
+axis_mapping = [[0, -1],  # X_MGM = -X_HH
+                [2, -1],  # Y_MGM = -Z_HH
+                [1, -1]]  # Z_MGM = -Y_HH,
 
 # Helmholtz control software tcp port
 s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)