function data = retrieve_descriptions(data)
json = webread('http://driver-observer.thi.de/static_uploads/computed_columns.json');
names = data.Properties.VariableNames;
for i = 1 : length(names)
    if isfield(json.units, names{i})
        data.Properties.VariableUnits{i} = json.units.(names{i});
        data.Properties.VariableDescriptions{i} = json.descriptions.(names{i});
    end
end
end