Update README.md

README.md

@@ -26,6 +26,8 @@ Simply use Git (or TortoiseGit):
 git clone https://huggingface.co/datasets/sraimund/MapPool/
 ```
 
+About 320 GB of space are required.
+
 ## How can the parquet files be read?
 
 You can read parquet files with [pandas](https://pandas.pydata.org/):