diff --git a/control/statesp.py b/control/statesp.py
index f7fe6a3b5..d69f7d7d1 100644
--- a/control/statesp.py
+++ b/control/statesp.py
@@ -537,8 +537,9 @@ def zero(self):
# from
# https://dspace.mit.edu/bitstream/handle/1721.1/841/P-0802-06587335.pdf.
# The QZ algorithm solves the generalized eigenvalue problem: given
- # `L = [A, B; C, D]` and `M = [I_nxn 0]`, find all finite λ for
- # which there exist nontrivial solutions of the equation `Lz - λMz`.
+ # `L = [A, B; C, D]` and `M = [I_nxn 0]`, find all finite lambda
+ # for which there exist nontrivial solutions of the equation
+ # `Lz - lamba Mz`.
#
# The generalized eigenvalue problem is only solvable if its
# arguments are square matrices.
diff --git a/control/tests/statesp_test.py b/control/tests/statesp_test.py
index 1677f6afe..fe1293fb5 100644
--- a/control/tests/statesp_test.py
+++ b/control/tests/statesp_test.py
@@ -42,7 +42,8 @@ def testPole(self):
np.testing.assert_array_almost_equal(p, true_p)
- def testZero(self):
+ @unittest.skipIf(not slycot_check(), "slycot not installed")
+ def testMIMOZero_nonsquare(self):
"""Evaluate the zeros of a MIMO system."""
z = np.sort(self.sys1.zero())
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