diff --git a/Firmware/mesh_bed_calibration.cpp b/Firmware/mesh_bed_calibration.cpp
index 62bcca3c..8ac050af 100644
--- a/Firmware/mesh_bed_calibration.cpp
+++ b/Firmware/mesh_bed_calibration.cpp
@@ -3129,6 +3129,11 @@ void mbl_settings_init() {
 	}
 }
 
+//parameter ix: index of mesh bed leveling point in X-axis
+//parameter iy: index of mesh bed leveling point in Y-axis
+//parameter meas_points: number of mesh bed leveling points in one axis; currently designed and tested for values 3 and 7
+//parameter zigzag: false if ix is considered 0 on left side of bed and ix rises with rising X coordinate; true if ix is considered 0 on the right side of heatbed for odd iy values (zig zag mesh bed leveling movements)  
+//function returns true if point is considered valid (typicaly in safe distance from magnet or another object which inflences PINDA measurements)
 bool mbl_point_measurement_valid(uint8_t ix, uint8_t iy, uint8_t meas_points, bool zigzag) {
 	    //"human readable" heatbed plan
 		//magnet proximity influence Z coordinate measurements significantly (40 - 100 um)