diff --git a/resources/definitions/fdmprinter.def.json b/resources/definitions/fdmprinter.def.json
index 14d7e7f39e..c9dae14bd4 100644
--- a/resources/definitions/fdmprinter.def.json
+++ b/resources/definitions/fdmprinter.def.json
@@ -3704,6 +3704,22 @@
                     "settable_per_mesh": false,
                     "settable_per_extruder": true
                 },
+                "support_tree_branch_diameter_angle":
+                {
+                    "label": "Tree Support Branch Diameter Angle",
+                    "description": "The angle of the branches' diameter as they gradually become thicker towards the bottom. An angle of 0 will cause the branches to have uniform thickness over their length. A negative angle makes them thinner towards the bottom, so be careful as they might disappear. A small positive angle can increase stability of the tree support.",
+                    "unit": "°",
+                    "type": "float",
+                    "minimum_value": "-89.9999",
+                    "maximum_value": "89.9999",
+                    "minimum_value_warning": "0",
+                    "maximum_value_warning": "15",
+                    "default_value": 5,
+                    "limit_to_extruder": "support_infill_extruder_nr",
+                    "enabled": "support_tree_enable",
+                    "settable_per_mesh": false,
+                    "settable_per_extruder": true
+                },
                 "support_tree_wall_thickness":
                 {
                     "label": "Tree Support Wall Thickness",