diff --git a/usadelndsoc/core.py b/usadelndsoc/core.py
index f1899c851c5963c01d55663384e8c16f84146444..43efe079613b90a978231a61d9e21c5dce7ad14e 100644
--- a/usadelndsoc/core.py
+++ b/usadelndsoc/core.py
@@ -162,12 +162,18 @@ class Core:
 
     @property
     def Ux(self):
-        """Modifiable view to Wilson link matrix array, for LEFT"""
+        """Modifiable view to Wilson link matrix array, for RIGHT.
+
+        The U for links to the LEFT is always the inverse of this.
+        """
         return self.U[:, :, 0, :, :]
 
     @property
     def Uy(self):
-        """Modifiable view to Wilson link matrix array, for UP"""
+        """Modifiable view to Wilson link matrix array, for UP.
+
+        The U for links to DOWN is always the inverse of this.
+        """
         return self.U[:, :, 1, :, :]