DOC: Provide URL of issue that motivated test case

slivingston · slivingston · commit c498d3d27a5d · 2016-12-26T06:30:49.000-05:00
[ci skip]
diff --git a/control/tests/phaseplot_test.py b/control/tests/phaseplot_test.py
@@ -56,6 +56,8 @@ def testOscillatorParams(self):
     def testNoArrows(self):
         # Test case from aramakrl that was generating a type error
         # System does not have arrows
+        # cf. issue #96,
+        # https://github.com/python-control/python-control/issues/96
         def d1(x1x2,t):
             x1,x2 = x1x2
             return np.array([x2, x2 - 2*x1])
