diff --git a/src/hdf5_lib.py b/src/hdf5_lib.py
index a7ab09b..92babfe 100644
--- a/src/hdf5_lib.py
+++ b/src/hdf5_lib.py
@@ -505,6 +505,10 @@ def save_processed_dataframe_to_hdf5(df, annotator, src_hdf5_path, script_date,
     # Get metadata
     metadata_dict = annotator.get_metadata()
 
+    # Prepare project level attributes
+
+    root_level_attributes = metadata_dict['metadata']['project']
+    
     # Prepare high-level attributes
     high_level_attributes = {
         'parent_files': metadata_dict['parent_files'],
@@ -538,6 +542,7 @@ def save_processed_dataframe_to_hdf5(df, annotator, src_hdf5_path, script_date,
 
     # Write to HDF5
     with h5py.File(output_filename, 'w') as h5file:
+        h5file.attrs.update(root_level_attributes)
         transfer_file_dict_to_hdf5(h5file, '/', file_dict)