Update README.md

README.md

@@ -28,7 +28,7 @@ This dataset contains 3 format but they store same contents:
   * Parquet files' name indicate the sqlite/duckdb table name.
   * It is recommended to use post.parquet when you need to export tons of content.
 * Duckdb (.duckdb)
-  * Although duckdb support index, provided duckdb file doesn't have index in it.
+  * have 2 versions: with/without index.
 
 `others` folder will contains some pre-exported files like tags for each post.