diff --git a/src/wireviz/DataClasses.py b/src/wireviz/DataClasses.py
index f481d284..0e82492f 100644
--- a/src/wireviz/DataClasses.py
+++ b/src/wireviz/DataClasses.py
@@ -25,11 +25,11 @@ class Connector:
     show_pincount: bool = True
     hide_disconnected_pins: bool = False
     autogenerate: bool = False
+    loops: List[Any] = field(default_factory=list)
 
     def __post_init__(self):
         self.ports_left = False
         self.ports_right = False
-        self.loops = []
         self.visible_pins = {}
 
         if self.pincount is None:
@@ -55,11 +55,12 @@ def __post_init__(self):
         if len(self.pinnumbers) != len(set(self.pinnumbers)):
             raise Exception('Pin numbers are not unique')
 
-    def loop(self, from_pin, to_pin):
-        self.loops.append((from_pin, to_pin))
-        if self.hide_disconnected_pins:
-            self.visible_pins[from_pin] = True
-            self.visible_pins[to_pin] = True
+        for loop in self.loops:
+            # TODO: check that pins to connect actually exist
+            # TODO: allow using pin labels in addition to pin numbers, just like when defining regular connections
+            # TODO: include properties of wire used to create the loop
+            if len(loop) != 2:
+                raise Exception('Loops must be between exactly two pins!')
 
     def activate_pin(self, pin):
         self.visible_pins[pin] = True
diff --git a/src/wireviz/Harness.py b/src/wireviz/Harness.py
index bcc3d28c..a5e5d6ee 100644
--- a/src/wireviz/Harness.py
+++ b/src/wireviz/Harness.py
@@ -22,9 +22,6 @@ def add_connector(self, name, *args, **kwargs):
     def add_cable(self, name, *args, **kwargs):
         self.cables[name] = Cable(name, *args, **kwargs)
 
-    def loop(self, connector_name, from_pin, to_pin):
-        self.connectors[connector_name].loop(from_pin, to_pin)
-
     def connect(self, from_name, from_pin, via_name, via_pin, to_name, to_pin):
 
         for (name, pin) in zip([from_name, to_name], [from_pin, to_pin]): # check from and to connectors
@@ -46,7 +43,6 @@ def connect(self, from_name, from_pin, via_name, via_pin, to_name, to_pin):
                             from_pin = pin
                         if name == to_name:
                             to_pin = pin
-                        # TODO: what happens with loops?
                 if not pin in connector.pinnumbers:
                     raise Exception(f'{name}:{pin} not found.')