diff --git a/boxes/__init__.py b/boxes/__init__.py
index 14ba173..e2e9b6e 100755
--- a/boxes/__init__.py
+++ b/boxes/__init__.py
@@ -329,7 +329,7 @@ class Boxes:
                 if default is None: default = "e"
                 self.argparser.add_argument(
                     "--top_edge", action="store",
-                    type=ArgparseEdgeType("ecESikvfL"), choices=list("ecESikvfL"),
+                    type=ArgparseEdgeType("efFcESikvfL"), choices=list("efFcESikvfL"),
                     default=default, help="edge type for top edge")
             elif arg == "outside":
                 if default is None: default = True