Update README.md

README.md

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 # Dataset Card for Open Protein Instructions (OPI)
 
 ## Dataset Update
-The OPI dataset is updated to contain **the latest release 2023_05** of UniProtKB/Swiss-Prot protein knowledgebase, which can be accessed via the dataset file [OPI_updated_160k.json](./OPI_DATA/OPI_updated_160k.json).
+The previous version of OPI dataset is based on the **release 2022_01** of UniProtKB/Swiss-Prot protein knowledgebase. At current, OPI is updated to contain the latest **release 2023_05**, which can be accessed the dataset file [OPI_updated_160k.json](./OPI_DATA/OPI_updated_160k.json).
 
-Please refer to https://ftp.uniprot.org/pub/databases/uniprot/previous_releases/release-2023_05/knowledgebase/UniProtKB_SwissProt-relstat.html for more details.
+Reference:
+- https://ftp.uniprot.org/pub/databases/uniprot/previous_releases/release-2022_01/knowledgebase/UniProtKB_SwissProt-relstat.html
+- https://ftp.uniprot.org/pub/databases/uniprot/previous_releases/release-2023_05/knowledgebase/UniProtKB_SwissProt-relstat.html
 
 ## Dataset Description