diff --git a/src/Mod/Draft/WorkingPlane.py b/src/Mod/Draft/WorkingPlane.py
index 62766160a2..934680dc3d 100644
--- a/src/Mod/Draft/WorkingPlane.py
+++ b/src/Mod/Draft/WorkingPlane.py
@@ -684,6 +684,10 @@ class plane:
             self.weak = True
 
     def reset(self):
+        """Reset the plane.
+
+        Set the `doc` attribute to `None`, and `weak` to `True`.
+        """
         self.doc = None
         self.weak = True