small numpydoc change in trasnferfunction to resolve merge

sawyerbfuller · sawyerbfuller · commit 3cf80afbbb3b · 2020-08-19T10:35:17.000-07:00
diff --git a/control/xferfcn.py b/control/xferfcn.py
@@ -211,8 +211,9 @@ def __call__(self, x, squeeze=True):
         continuous-time systems and `z` for discrete-time systems. 
 
         To evaluate at a frequency omega in radians per second, enter 
-        ``x = omega*1j``, for continuous-time systems, or ``x = exp(1j*omega*dt)``
-        for discrete-time systems.
+        ``x = omega * 1j``, for continuous-time systems, or 
+        ``x = exp(1j * omega * dt)`` for discrete-time systems. Or use 
+        :meth:`TransferFunction.frequency_response`. 
 
         Parameters
         ----------
