diff --git a/auto_lens/profile.py b/auto_lens/profile.py
index <HASH>..<HASH> 100644
--- a/auto_lens/profile.py
+++ b/auto_lens/profile.py
@@ -484,6 +484,7 @@ class EllipticalIsothermalMassProfile(EllipticalPowerLawMassProfile):
         ----------
         The deflection angles at these coordinates
         """
+        # TODO: Finish this and add tests
         coordinates = self.coordinates_rotate_to_elliptical(coordinates)
         psi = math.sqrt( (self.axis_ratio**2)*(coordinates[0]**2) + coordinates[1]**2)
         defl_x = self.normalization * math.atan((math.sqrt(1 - self.axis_ratio ** 2) * coordinates[0]) / (psi))
Added to do to SIE deflection method