diff --git a/docs/source/usersguide/input.rst b/docs/source/usersguide/input.rst
index b275774002..b12f914a42 100644
--- a/docs/source/usersguide/input.rst
+++ b/docs/source/usersguide/input.rst
@@ -2034,15 +2034,20 @@ the following attributes/sub-elements:
     A unique integer that can be used to identify the derivative.
 
   :variable:
-    The independent variable of the derivative. Accepted options are
-    "density" and "nuclide_density". A "density" derivative will give the
+    The independent variable of the derivative. Accepted options are "density",
+    "nuclide_density", and "temperature". A "density" derivative will give the
     derivative with respect to the density of the material in [g / cm^3]. A
-    "nuclide_density" derivative will give the derivative with respect to
-    the density of a particular nuclide in units of [atom / b / cm].
+    "nuclide_density" derivative will give the derivative with respect to the
+    density of a particular nuclide in units of [atom / b / cm].  A
+    "temperature" derivative is with respect to a material temperature in units
+    of [K].  The temperature derivative requires windowed multipole to be
+    turned on.  Note also that the temperature derivative only acconuts for
+    resolved resonance Doppler broadening.  It does not account for thermal
+    expansion, S(a, b) scattering, resonance scattering, or unresolved Doppler
+    broadening.
 
   :material:
-    The perturbed material. (Necessary for both "density" and
-    "nuclide_density")
+    The perturbed material. (Necessary for all derivative types)
 
   :nuclide:
     The perturbed nuclide. (Necessary only for "nuclide_density")
diff --git a/src/relaxng/tallies.rnc b/src/relaxng/tallies.rnc
index 4522adff55..2143c8e472 100644
--- a/src/relaxng/tallies.rnc
+++ b/src/relaxng/tallies.rnc
@@ -25,8 +25,10 @@ element tallies {
           | attribute variable { ( "nuclide_density" ) } )
         &
         (element nuclide { xsd:string { maxLength = "12" } }
-          | attribute nuclide { xsd:string { maxLength = "12" } } )
+          | attribute nuclide { xsd:string { maxLength = "12" } } ) |
       )
+      (element variable { ( "temperature") }
+        | attribute variable { ( "temperature" ) } )
     )
   }* &
 
diff --git a/src/relaxng/tallies.rng b/src/relaxng/tallies.rng
index 3f88b07608..fc60b8373a 100644
--- a/src/relaxng/tallies.rng
+++ b/src/relaxng/tallies.rng
@@ -139,6 +139,14 @@
                 </attribute>
               </choice>
             </interleave>
+            <choice>
+              <element name="variable">
+                <value>temperature</value>
+              </element>
+              <attribute name="variable">
+                <value>temperature</value>
+              </attribute>
+            </choice>
           </choice>
         </interleave>
       </element>