Update README.md

README.md

@@ -54,7 +54,7 @@ For each split, there are several fields:
 1. "index": Index number starting from 0. It's the primary key;
 2. "text": The content of the paper in pure text form. Newline is turned into 3 spaces if "-" is not detected;
 3. "year": A **string** of the paper's publication year, like "2018". Transform it into int if you need to;
-4. "No": A **string** of index number within a year. 1-indexed. It's not very useful and may be omitted.
+4. "No": A **string** of index number within a year. 1-indexed. In "ECCV" split, the "No" is index number throughout the entire split. It only provides a reference of the order that these papers are accessed, instead of the real publication order.
 
 The "ICLR" split may miss roughly 20%-25% of the papers, since it's collected by searching on arxiv, which may return 0 or more than 1 results.