diff --git a/contributed_definitions/NXdispersive_material.nxdl.xml b/contributed_definitions/NXdispersive_material.nxdl.xml
index 452c38482..9748c78c4 100644
--- a/contributed_definitions/NXdispersive_material.nxdl.xml
+++ b/contributed_definitions/NXdispersive_material.nxdl.xml
@@ -46,6 +46,15 @@
                 <item value="NXdispersive_material"/>
             </enumeration>
         </field>
+        <field name="program" type="NX_CHAR">
+          <doc>Name of the program used for creating this dispersion</doc>
+        </field>
+        <field name="version" type="NX_CHAR">
+          <doc>Version of the program used</doc>
+        </field>
+        <field name="date" type="NX_DATE_TIME">
+          <doc>Date and time of creating this dispersion.</doc>
+        </field>
         <group name="sample" type="NXsample">
             <field name="chemical_formula" type="NX_CHAR"/>
             <field name="atom_types" type="NX_CHAR" optional="true">
diff --git a/manual/source/classes/contributed_definitions/ellipsometry-structure.rst b/manual/source/classes/contributed_definitions/ellipsometry-structure.rst
index cb690fac4..1f3ddbfaf 100644
--- a/manual/source/classes/contributed_definitions/ellipsometry-structure.rst
+++ b/manual/source/classes/contributed_definitions/ellipsometry-structure.rst
@@ -57,7 +57,7 @@ This is the set of base classes for describing an optical experiment.
        Description of an optical lens.
        
     :ref:`NXpolarizer_opt`
-       A spin polarizer.
+       An optical polarizer.
 
     :ref:`NXwaveplate`
        A waveplate or retarder.