diff --git a/resources/definitions/fdmprinter.def.json b/resources/definitions/fdmprinter.def.json
index 5a0f2cd0c1..d23a27396c 100644
--- a/resources/definitions/fdmprinter.def.json
+++ b/resources/definitions/fdmprinter.def.json
@@ -228,7 +228,7 @@
                 "machine_heat_zone_length":
                 {
                     "label": "Heat zone length",
-                    "description": "The distance from the tip of the nozzle in which heat from the nozzle is transferred to the filament.",
+                    "description": "The distance from the tip of the nozzle in which heat from the nozzle is transferred to the filament. When an extruder is not needed any more, its filament is moved out of the heat zone.",
                     "default_value": 16,
                     "type": "float",
                     "settable_per_mesh": false,