Update README.md

README.md

@@ -22,6 +22,8 @@ missed_lines: number of lines in the document where the index matched between th
 inserted_lines_src: lines that only appear in the source document, and matches are found surrounding them, indicating the line is some kind of insertion (like a note, afterword, title, etc). Is generally safe to ignore unless it's significant compared to the number of correctly aligned sentences, which would indicate a poor matchup between source and translation sources, for one reason or another.
 
 inserted_lines_src: same as above, but for the target document instead
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 # Dataset Sources
 news_commentary (unknown license?)