diff --git a/boxes/__init__.py b/boxes/__init__.py
index c1fc302..1ef64d7 100755
--- a/boxes/__init__.py
+++ b/boxes/__init__.py
@@ -256,7 +256,7 @@ class Boxes:
             elif arg == "top_edge":
                 self.argparser.add_argument(
                     "--top_edge",  action="store",
-                    type=ArgparseEdgeType("ecESi"), choices=list("ecESi"),
+                    type=ArgparseEdgeType("ecESik"), choices=list("ecESik"),
                     default="e", help="edge type for top edge")
             else:
                 raise ValueError("No default for argument", arg)
diff --git a/boxes/edges.py b/boxes/edges.py
index 4df6003..b02248c 100644
--- a/boxes/edges.py
+++ b/boxes/edges.py
@@ -19,9 +19,11 @@ import math
 import inspect
 
 def getDescriptions():
-    return {edge.char : edge.description for edge in globals().values()
-            if inspect.isclass(edge) and issubclass(edge, BaseEdge)
-            and edge.char}
+    d = {edge.char : edge.description for edge in globals().values()
+         if inspect.isclass(edge) and issubclass(edge, BaseEdge)
+         and edge.char}
+    d['k'] = "Straight edge with hinge eye (both ends)"
+    return d
 
 class BoltPolicy(object):
     """Abstract class