diff --git a/data/fields/line_arrangement.json b/data/fields/line_arrangement.json
index 86f624a4..3257bac7 100644
--- a/data/fields/line_arrangement.json
+++ b/data/fields/line_arrangement.json
@@ -8,8 +8,8 @@
             "vertical": "Vertical",
             "semi_vertical": "semi-vertical",
             "square": "Square",
-            "triangular": "Triangular",
-            "delta": "Delta",
+            "triangular": "Triangular (scalene)",
+            "delta": "Triangular (isosceles)",
             "unarranged": "Unarranged"
         }
     },