Update docs/products/kafka/concepts/tiered-storage-how-it-works.rst

Co-authored-by: Jorge Esteban Quilcate Otoya <jorge.quilcate@aiven.io>

docs/products/kafka/concepts/tiered-storage-how-it-works.rst

@@ -35,7 +35,8 @@ The replication factor is not considered during the upload process, and only one
 
 Data retrieval
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-When consumers fetch records stored in remote storage, the broker downloads and caches these records locally. This allows for quicker access in subsequent retrieval operations. 
+When consumers fetch records stored in remote storage, the broker downloads and caches these records locally. This allows for quicker access in subsequent retrieval operations.
+Aiven will use a small amount of disk (between 2GB and 16GB, based on the 5% of disk available on the broker) to store records fetched temporally.
 
 
 Security