diff --git a/src/nomad_measurements/xrd/schema.py b/src/nomad_measurements/xrd/schema.py
index c312e03f..d43af39b 100644
--- a/src/nomad_measurements/xrd/schema.py
+++ b/src/nomad_measurements/xrd/schema.py
@@ -930,6 +930,13 @@ class ELNXRayDiffraction(XRayDiffraction, EntryData, PlotSection):
             component=ELNComponentEnum.FileEditQuantity,
         ),
     )
+    auxiliary_hdf5_file = Quantity(
+        type=str,
+        description='Auxiliary HDF5 file containing the raw data',
+        a_eln=ELNAnnotation(
+            component=ELNComponentEnum.FileEditQuantity,
+        ),
+    )
     measurement_identifiers = SubSection(
         section_def=ReadableIdentifiers,
     )