diff --git a/uravu/distribution.py b/uravu/distribution.py
index c569985..16118ef 100644
--- a/uravu/distribution.py
+++ b/uravu/distribution.py
@@ -127,6 +127,7 @@ def n(self):
         """
         return np.percentile(self.samples, [50])[0]
 
+    @property
     def s(self):
         """
         Get the standard deviation of the distribution. For a non-normal distribution, this will return :py:attr:`None`.
diff --git a/uravu/tests/test_optimize.py b/uravu/tests/test_optimize.py
index 89b7e09..1382bb5 100644
--- a/uravu/tests/test_optimize.py
+++ b/uravu/tests/test_optimize.py
@@ -23,10 +23,7 @@ class TestOptimize(unittest.TestCase):
     Unit tests for optimize module.
     """
 
-    def test_ln_likelihood_a(self):
-        """
-        Test ln_likelihood function.
-        """
+    def test_ln_likelihood(self):
         test_rel = relationship.Relationship(
             utils.straight_line, TEST_X, TEST_Y 
         )
@@ -37,9 +34,6 @@ def test_ln_likelihood_a(self):
         assert_almost_equal(actual_lnl, expected_lnl, decimal=0)
 
     def test_negative_lnl(self):
-        """
-        Test negative_lnl function.
-        """
         test_rel = relationship.Relationship(
             utils.straight_line, TEST_X, TEST_Y 
         )
@@ -50,9 +44,6 @@ def test_negative_lnl(self):
         assert_almost_equal(actual_negative_lnl, expected_negtive_lnl, decimal=0)
 
     def test_max_lnlikelihood(self):
-        """
-        Test negative_lnl function.
-        """
         test_rel = relationship.Relationship(
             utils.straight_line, TEST_X, TEST_Y 
         )