diff --git a/BLTouch-Installation-(english).md b/BLTouch-Installation-(english).md
index dafddd5..b59adbc 100644
--- a/BLTouch-Installation-(english).md
+++ b/BLTouch-Installation-(english).md
@@ -148,7 +148,7 @@ For the next steps we need the printer, a PC and Pronterface
 15. Slowly lower the nozzle with **G1 Z-1** or **G1 Z-0.1** or **G1 Z-0.02** until the paper is difficult to move.
 16. **M114** = Current position of the nozzle -> note! (e.g. Recv: X:38.00 Y:15.00 Z:0.70 E:0.00 Count X:3200 Y:3200 Z:520)
 17. Subtract the Z value from point 16 from that from point 10 -> 1.30 - 0.7 = **0.6 mm** -> This is our Z offset.
-18. **M851 Z-0.6**
+18. **M851 Z-0.6** (be aware of the negative sign!)
 19. **M500**
 20. Carry out BL Touch leveling again via the display. Finished.