diff --git a/resources/definitions/fdmprinter.def.json b/resources/definitions/fdmprinter.def.json
index 537093bf51..0854d34305 100755
--- a/resources/definitions/fdmprinter.def.json
+++ b/resources/definitions/fdmprinter.def.json
@@ -987,6 +987,16 @@
                     "settable_per_mesh": true,
                     "enabled": "topmost_skin_layer_count > 0 and top_layers > 0"
                 },
+                "topmost_skin_angles":
+                {
+                    "label": "Roofing Line Directions",
+                    "description": "A list of integer line directions to use when the roofing layers use the lines or zig zag pattern. Elements from the list are used sequentially as the layers progress and when the end of the list is reached, it starts at the beginning again. The list items are separated by commas and the whole list is contained in square brackets. Default is an empty list which means use the traditional default angles (45 and 135 degrees).",
+                    "type": "[int]",
+                    "default_value": "[ ]",
+                    "enabled": "topmost_skin_pattern != 'concentric'",
+                    "limit_to_extruder": "topmost_skin_extruder_nr",
+                    "settable_per_mesh": true
+                },
                 "top_bottom_extruder_nr":
                 {
                     "label": "Top/Bottom Extruder",