diff --git a/tests/test_energy_laws/geometry.xml b/tests/test_energy_laws/geometry.xml
index bb0e15d47f..c42f45597d 100644
--- a/tests/test_energy_laws/geometry.xml
+++ b/tests/test_energy_laws/geometry.xml
@@ -1,7 +1,5 @@
 <?xml version="1.0"?>
 <geometry>
-
   <surface id="1" type="sphere" coeffs="0 0 0 100" boundary="vacuum"/>
   <cell id="1" material="1" region="-1" />
-
 </geometry>
diff --git a/tests/test_energy_laws/materials.xml b/tests/test_energy_laws/materials.xml
index 1a40aeb1db..97f9b84be1 100644
--- a/tests/test_energy_laws/materials.xml
+++ b/tests/test_energy_laws/materials.xml
@@ -1,11 +1,11 @@
 <?xml version="1.0"?>
 <materials>
-
+  <default_xs>71c</default_xs>
   <material id="1">
     <density value="20" units="g/cc" />
-    <nuclide name="U-233" xs="71c" ao="1.0" />
-    <nuclide name="H-2" xs="71c" ao="1.0" />
-    <nuclide name="Na-23" xs="71c" ao="1.0" />
+    <nuclide name="U-233" ao="1.0" />
+    <nuclide name="H-2" ao="1.0" />
+    <nuclide name="Na-23" ao="1.0" />
+    <nuclide name="Ta-181" ao="1.0" />
   </material>
-
 </materials>
diff --git a/tests/test_energy_laws/results_true.dat b/tests/test_energy_laws/results_true.dat
index 777d0790d4..48eb6bc81b 100644
--- a/tests/test_energy_laws/results_true.dat
+++ b/tests/test_energy_laws/results_true.dat
@@ -1,2 +1,2 @@
 k-combined:
-2.421637E+00 5.324089E-03
+2.130076E+00 1.938907E-03
diff --git a/tests/test_energy_laws/settings.xml b/tests/test_energy_laws/settings.xml
index 9f0e8ed05f..1c3f444f0f 100644
--- a/tests/test_energy_laws/settings.xml
+++ b/tests/test_energy_laws/settings.xml
@@ -1,14 +1,11 @@
 <?xml version="1.0"?>
 <settings>
-
   <eigenvalue>
     <batches>10</batches>
     <inactive>5</inactive>
     <particles>1000</particles>
   </eigenvalue>
-
   <source>
     <space type="point" parameters="0. 0. 0." />
   </source>
-
 </settings>
diff --git a/tests/test_energy_laws/test_energy_laws.py b/tests/test_energy_laws/test_energy_laws.py
index 5f436e4694..0e593876fc 100644
--- a/tests/test_energy_laws/test_energy_laws.py
+++ b/tests/test_energy_laws/test_energy_laws.py
@@ -1,11 +1,20 @@
 #!/usr/bin/env python
 
-"""The purpose of this test is to provide coverage of Watt, N-body phase space,
-and evaporation energy distributions. The only nuclide that uses a Watt fission
-spectrum in ENDF/B-VII.1 is U-233. The only nuclide that has a reaction using
-the N-body phase space distribution is H-2(n.2n). Several nuclides have
-reactions with evaporation spectra. In this test, the material is composed of
-U-233, H-2, and Na-23 (which has several reactions with evaporation spectra.
+"""The purpose of this test is to provide coverage of energy distributions that
+are not covered in other tests. It has a single material with the following
+nuclides:
+
+U-233: Only nuclide that has a Watt fission spectrum
+
+H-2: Only nuclide that has an N-body phase space distribution, in this case for
+(n,2n)
+
+Na-23: Has an evaporation spectrum and also has reactions that have multiple
+angle-energy distributions, so it provides coverage for both of those
+situations.
+
+Ta-181: One of a few nuclides that has reactions with Kalbach-Mann distributions
+that use linear-linear interpolation.
 
 """