Update README.md

README.md

@@ -21,9 +21,9 @@ We hope it can serve as an aid in the development of language-based proof assist
 
 There are two versions of the data: `proofs` divides up the data proof-by-proof, and `sentences` further divides up the same data sentence-by-sentence.
 
-* The data in `proofs` consists of a `paperID` that specifies the paper where the proof was extracted, and the `proof` as a string.
+* The data in `proofs` consists of a `fileID` that specifies the paper where the proof was extracted, and the `proof` as a string.
 
-* The data in `sentences` consists of a `paperID` that specifies the paper where the sentence occurred, and the `sentence` as a string.
+* The data in `sentences` consists of a `fileID` that specifies the paper where the sentence occurred, and the `sentence` as a string.
 
 ## Dataset usage