diff --git a/contributed_definitions/NXmpes_liquid.nxdl.xml b/contributed_definitions/NXmpes_liquid.nxdl.xml
index 1695c8d252..61ba7317d0 100644
--- a/contributed_definitions/NXmpes_liquid.nxdl.xml
+++ b/contributed_definitions/NXmpes_liquid.nxdl.xml
@@ -94,6 +94,22 @@
              (users are encouraged to expand on that in group preparation_description).
         </doc>
       </field>
+      <field name="temperature" type="NX_NUMBER" optional="true">
+        <doc>
+             The temperature set for the liquid jet or the injection assembly.
+             Details may be added to the preparation description how this
+             temperature value is obtained
+             (whether a chiller unit was used, point of cooling, temperature reading etc.)
+             and where this value would be expected
+             (estimate for the jet assembly, the liquid prior to injection,
+             or at the interaction point taking into account evaporative cooling etc.).
+        </doc>
+      </field>
+      <field name="gas_pressure" type="NX_NUMBER" optional="true">
+        <doc>
+             Pressure reading in the interaction chamber under operation conditions.
+        </doc>
+      </field>
       <field name="depends_on" recommended="true">
         <doc>
              Connects this liquidjet to its transformation chain.
diff --git a/contributed_definitions/nyaml/NXmpes_liquid.yaml b/contributed_definitions/nyaml/NXmpes_liquid.yaml
index 485eda3598..5914df445d 100644
--- a/contributed_definitions/nyaml/NXmpes_liquid.yaml
+++ b/contributed_definitions/nyaml/NXmpes_liquid.yaml
@@ -54,6 +54,20 @@ NXmpes_liquid(NXmpes):
         doc: |
           Material the microjet nozzle is made of
           (users are encouraged to expand on that in group preparation_description).
+      temperature(NX_NUMBER):
+        exists: optional
+        doc: |
+          The temperature set for the liquid jet or the injection assembly.
+          Details may be added to the preparation description how this
+          temperature value is obtained
+          (whether a chiller unit was used, point of cooling, temperature reading etc.)
+          and where this value would be expected
+          (estimate for the jet assembly, the liquid prior to injection,
+          or at the interaction point taking into account evaporative cooling etc.).
+      gas_pressure(NX_NUMBER):
+        exists: optional
+        doc: |
+          Pressure reading in the interaction chamber under operation conditions.
       depends_on:
         exists: recommended
         doc: |