diff --git a/boxes/__init__.py b/boxes/__init__.py
index bf9c2c2..ea84f19 100755
--- a/boxes/__init__.py
+++ b/boxes/__init__.py
@@ -341,7 +341,7 @@ class Boxes:
                 if default is None: default = "e"
                 self.argparser.add_argument(
                     "--top_edge", action="store",
-                    type=ArgparseEdgeType("efFcESikvfL"), choices=list("efFcESikvfL"),
+                    type=ArgparseEdgeType("efFcESikvfLt"), choices=list("efFcESikvfLt"),
                     default=default, help="edge type for top edge")
             elif arg == "outside":
                 if default is None: default = True
diff --git a/boxes/lids.py b/boxes/lids.py
index cca9a4f..c0ee2e4 100644
--- a/boxes/lids.py
+++ b/boxes/lids.py
@@ -97,6 +97,7 @@ class _TopEdge(Boxes):
         self.addSettingsArgs(edges.CabinetHingeSettings)
         self.addSettingsArgs(edges.LidSettings)
         self.addSettingsArgs(edges.ClickSettings)
+        self.addSettingsArgs(edges.RoundedTriangleEdgeSettings)
 
     def topEdges(self, top_edge):
         t1 = t2 = t3 = t4 = self.edges.get(top_edge, self.edges["e"])
@@ -112,7 +113,8 @@ class _TopEdge(Boxes):
             t3 = "N"
         elif t1.char == "v":
             t2 = t3 = t4 = "e"
-
+        if t1.char == "t":
+            t1 = t3 = "e"
         return [t1, t2, t3, t4]
 
     def drawLid(self, x, y, top_edge, bedBolts=[None, None]):