diff --git a/contributed_definitions/NXstress.nxdl.xml b/contributed_definitions/NXstress.nxdl.xml
index fd0116903..7f50bcbe9 100644
--- a/contributed_definitions/NXstress.nxdl.xml
+++ b/contributed_definitions/NXstress.nxdl.xml
@@ -245,7 +245,7 @@
 	            </field>
                 <field name="wavelength" type="NX_FLOAT" optional="true">
                     <doc>
-                        In case of monochromatic radiation, the wavelength used during the experiment. The wavelength should be provided in \ :math:`\unicode{x212B}`, but if chosen otherwise, the units must be clearly specified.
+                        In case of monochromatic radiation, the wavelength used during the experiment. The wavelength should be provided in \ :math:`Å`, but if chosen otherwise, the units must be clearly specified.
                     </doc>
                 </field>
             </group>
@@ -1007,11 +1007,11 @@
                         It defines the *cUnit* as follows
 
                             - if *center_type="two-theta"* then *cUnit* must have the angle unit *degrees*
-                            - if *center_type="energy"* then *cUnit* must have the energy unit *keV*
-                            - if *center_type="momentum-transfer"* then *cUnit* must have the energy unit \ :math:`\unicode{x212B}^{-1}`
-                            - if *center_type="d-spacing"* then *cUnit* must have the energy unit \ :math:`\unicode{x212B}`
+                            - if *center_type="energy"* then *cUnit* must have the unit *keV*
+                            - if *center_type="momentum-transfer"* then *cUnit* must have the unit \ :math:`Å^{-1}`
+                            - if *center_type="d-spacing"* then *cUnit* must have the unit \ :math:`Å`
                             - if *center_type="channel"* then *cUnit* must be *dimensioness*
-                            - if *center_type="time-of-flight"* then *cUnit* must have the time-of-flight unit \ :math:`\mu\mathrm{s}`
+                            - if *center_type="time-of-flight"* then *cUnit* must have the unit \ :math:`\mu\mathrm{s}`
                 </doc>
                 <enumeration>
                     <item value="two-theta" />