diff --git a/src/allotropy/allotrope/schema_mappers/adm/spectrophotometry/benchling/_2023/_12/spectrophotometry.py b/src/allotropy/allotrope/schema_mappers/adm/spectrophotometry/benchling/_2023/_12/spectrophotometry.py
index 4a8ed81465..4f41ee72f1 100644
--- a/src/allotropy/allotrope/schema_mappers/adm/spectrophotometry/benchling/_2023/_12/spectrophotometry.py
+++ b/src/allotropy/allotrope/schema_mappers/adm/spectrophotometry/benchling/_2023/_12/spectrophotometry.py
@@ -127,6 +127,7 @@ class MeasurementGroup:
     container_type: str | None = None
 
     processed_data: ProcessedData | None = None
+    custom_info: dict[str, Any] | None = None
 
 
 @dataclass(frozen=True)
@@ -194,16 +195,19 @@ def _get_technique_document(
     ) -> SpectrophotometryDocumentItem:
         return SpectrophotometryDocumentItem(
             analyst=measurement_group.analyst,
-            measurement_aggregate_document=MeasurementAggregateDocument(
-                measurement_time=self.get_date_time(
-                    assert_not_none(measurement_group.measurement_time)
+            measurement_aggregate_document=add_custom_information_document(
+                MeasurementAggregateDocument(
+                    measurement_time=self.get_date_time(
+                        assert_not_none(measurement_group.measurement_time)
+                    ),
+                    experiment_type=measurement_group.experiment_type,
+                    container_type=metadata.container_type,
+                    measurement_document=[
+                        self._get_measurement_document_item(measurement, metadata)
+                        for measurement in measurement_group.measurements
+                    ],
                 ),
-                experiment_type=measurement_group.experiment_type,
-                container_type=metadata.container_type,
-                measurement_document=[
-                    self._get_measurement_document_item(measurement, metadata)
-                    for measurement in measurement_group.measurements
-                ],
+                measurement_group.custom_info,
             ),
         )
 
diff --git a/src/allotropy/parsers/thermo_fisher_visionlite/thermo_fisher_visionlite_structure.py b/src/allotropy/parsers/thermo_fisher_visionlite/thermo_fisher_visionlite_structure.py
index caa112f610..2e1852310e 100644
--- a/src/allotropy/parsers/thermo_fisher_visionlite/thermo_fisher_visionlite_structure.py
+++ b/src/allotropy/parsers/thermo_fisher_visionlite/thermo_fisher_visionlite_structure.py
@@ -124,6 +124,9 @@ def create(
                     analyst=header.analyst,
                     measurement_time=header.measurement_time,
                     experiment_type=experiment_type.value,
+                    custom_info=reader.header.get_unread(skip={"File Name"})
+                    if reader.header
+                    else {},
                     measurements=[
                         Measurement(
                             type_=experiment_type.measurement_type,
@@ -139,7 +142,7 @@ def create(
             for _, row in data.iterrows():
                 row_data = SeriesData(row)
                 measurements = _get_absorbance_measurements(
-                    row_data, experiment_type, wavelength_cols
+                    row_data, experiment_type, wavelength_cols, reader.header
                 )
                 measurement_groups.append(
                     MeasurementGroup(
@@ -196,6 +199,7 @@ def _get_absorbance_measurements(
     data: SeriesData,
     experiment_type: ExperimentType,
     wavelength_cols: dict[int, str],
+    header: SeriesData | None = None,
 ) -> list[Measurement]:
     if experiment_type == ExperimentType.QUANT:
         ordinate_col = "Ordinate [A]"
@@ -232,6 +236,10 @@ def _get_absorbance_measurements(
             absorbance=measurement.absorbance,
             dilution_factor_setting=data.get(float, "Dilution factor"),
             detector_wavelength_setting=try_float_or_none(measurement.wavelength),
+            custom_info={
+                **data.get_unread(skip={"Result"}),
+                **(header.get_unread(skip={"File Name"}) if header else {}),
+            },
         )
         for measurement in absorbance_measurements
     ]