Update README.md

README.md

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 This dataset contains an extended version of the original label set of BigEarthNet-19 for Hierarchical Multi-Label Classification.
 
+## Dataset creation
+
+It was created based on the CORINE Land Cover database of the year 2018 (CLC 2018), which provides detailed information about the land cover classes at multiple levels of the hierarchy
+
 ## Loading the Dataset
 
 To load the dataset into your project, you can use the following code snippet: