# vtkPolyData : add attribute/annotation
**URL:** https://discourse.vtk.org/t/vtkpolydata-add-attribute-annotation/10148
**Category:** Support
**Created:** [December 10, 2022, 6:51pm UTC](https://discourse.vtk.org/t/vtkpolydata-add-attribute-annotation/10148 "2022-12-10T18:51:17Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Nicholas\_Yue](https://discourse.vtk.org/u/Nicholas_Yue)
#### Post date: [December 10, 2022, 6:51pm UTC](https://discourse.vtk.org/t/vtkpolydata-add-attribute-annotation/10148/1 "2022-12-10T18:51:17Z")
Hi,
I wish to record some meta data regarding the source information that goes into the creation of a given vtkPolyData (for versioning/history/tracking purpose)
Is there some way to add such sting/integer information as institution, author, date-time ?
Cheers
---
### Author:  [@mwestphal](https://discourse.vtk.org/u/mwestphal)
#### Post date: [December 12, 2022, 8:16am UTC](https://discourse.vtk.org/t/vtkpolydata-add-attribute-annotation/10148/2 "2022-12-12T08:16:58Z")
Hi @Nicholas_Yue
Usually, FieldData are used for that purpose.
Best,
---
### Author:  [@Nicholas\_Yue](https://discourse.vtk.org/u/Nicholas_Yue)
#### Post date: [December 14, 2022, 6:33am UTC](https://discourse.vtk.org/t/vtkpolydata-add-attribute-annotation/10148/3 "2022-12-14T06:33:13Z")
Thank you @mwestphal, it worked.
```auto
vtkNew source_geometry_fielddata;
vtkNew source_geometry_filepath_array;
source_geometry_filepath_array->SetName("src_path");
source_geometry_filepath_array->SetNumberOfComponents(1);
source_geometry_filepath_array->InsertNextValue(vtk_file);
source_geometry_fielddata->AddArray(source_geometry_filepath_array);
std::string sha1;
if (computeFileSHA1(vtk_file, sha1)) {
vtkNew source_sha1_array;
source_sha1_array->SetName("src_sha1");
source_sha1_array->SetNumberOfComponents(1);
source_sha1_array->InsertNextValue(sha1);
source_geometry_fielddata->AddArray(source_sha1_array);
}
source->SetFieldData(source_geometry_fielddata);
```
and it shows up nicely in ParaView too
