diff --git a/src/H5ChunkedWriter.cpp b/src/H5ChunkedWriter.cpp
index 8e317e6..7f3d293 100644
--- a/src/H5ChunkedWriter.cpp
+++ b/src/H5ChunkedWriter.cpp
@@ -4,6 +4,7 @@
 #include <iostream>
 
 #include "H5ChunkedWriter.hpp"
+#include "h5_file_format.hpp"
 
 extern "C"
 {
@@ -102,15 +103,8 @@ void HDF5ChunkedWriter::close_file()
         cout << "[HDF5ChunkedWriter::close_file] Setting dataset attribute image_nr_low=" << image_nr_low << " and image_nr_high=" << image_nr_high << endl;
     #endif
 
-    // H5::IntType int_type(H5::PredType::NATIVE_UINT32);
-    // H5::DataSpace att_space(H5S_SCALAR);
-    // auto low_index_attribute = dataset.createAttribute("image_nr_low", int_type, att_space);
-
-    // H5::IntType int_type(H5::PredType::NATIVE_UINT32);
-    // H5::DataSpace att_space(H5S_SCALAR);
-    // auto high_index_attribute = dataset.createAttribute("image_nr_high", int_type, att_space);
-
-    // TODO: Populate additional h5 attributes.
+    h5_utils::write_attribute(dataset, "image_nr_low", image_nr_low);
+    h5_utils::write_attribute(dataset, "image_nr_high", image_nr_high);
 
     // Cleanup.
     file.close();
@@ -234,3 +228,6 @@ hsize_t HDF5ChunkedWriter::prepare_storage_for_frame(size_t frame_index, size_t*
 
     return relative_frame_index;
 }
+
+void HDF5ChunkedWriter::write_format(h5_base& format_root, std::map<std::string, h5_value>& values) {
+}
\ No newline at end of file
diff --git a/src/H5ChunkedWriter.hpp b/src/H5ChunkedWriter.hpp
index c8c4a5a..bb7f029 100644
--- a/src/H5ChunkedWriter.hpp
+++ b/src/H5ChunkedWriter.hpp
@@ -1,12 +1,17 @@
 #ifndef H5CHUNKEDWRITER_H
 #define H5CHUNKEDWRITER_H
 
+#include <map>
 #include "config.hpp"
+#include "h5_file_format.hpp"
+#include <boost/any.hpp>
 
 hsize_t expand_dataset(const H5::DataSet& dataset, hsize_t frame_index, hsize_t dataset_increase_step);
 
 void compact_dataset(const H5::DataSet& dataset, hsize_t max_frame_index);
 
+typedef boost::any h5_value;
+
 class HDF5ChunkedWriter
 {
     // Initialized in constructor.
@@ -34,6 +39,7 @@ class HDF5ChunkedWriter
         ~HDF5ChunkedWriter();
         void close_file();
         void write_data(size_t frame_index, size_t* frame_shape, size_t data_bytes_size, char* data);
+        void write_format(h5_base& format_root, std::map<std::string, h5_value>& values);
 };
 
 #endif
\ No newline at end of file