docs: Note PROBE_CALIBRATE results invalidated on motion system update

Any hardware change to the hotend or probe, change to the kinematics,
or change to the bed tilt is likely to invalidate the results of
PROBE_CALIBRATE.  Try to warn the user of that.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

1 files changed, 15 insertions, 0 deletions

diff --git a/docs/Probe_Calibrate.md b/docs/Probe_Calibrate.md
index f7e62b4c..5ec06bda 100644
--- a/docs/Probe_Calibrate.md
+++ b/docs/Probe_Calibrate.md
@@ -70,6 +70,21 @@ results to the config file with:
 SAVE_CONFIG
 ```
 
+Note that if a change is made to the printer's motion system, hotend
+position, or probe location then it will invalidate the results of
+PROBE_CALIBRATE.
+
+If the probe has an X or Y offset and the bed tilt is changed (eg, by
+adjusting bed screws, running DELTA_CALIBRATE, running Z_TILT_ADJUST,
+running QUAD_GANTRY_LEVEL, or similar) then it will invalidate the
+results of PROBE_CALIBRATE. After making any of the above adjustments
+it will be necessary to run PROBE_CALIBRATE again.
+
+If the results of PROBE_CALIBRATE are invalidated, then any previous
+[bed mesh](Bed_Mesh.md) results that were obtained using the probe are
+also invalidated - it will be necessary to rerun BED_MESH_CALIBRATE
+after recalibrating the probe.
+
 # Repeatability check
 
 After calibrating the probe X, Y, and Z offsets it is a good idea to