Update README.md

README.md

@@ -39,7 +39,16 @@ are expected to be assigned in the script:
   `wikihow.data.tar.xz`)
 
 All the data in need are offered in `wikihow.data.tar.xz`. (The archive is
-about 78 GiB. And the decompressed data are about 88 GiB.)
+about 78 GiB. And the decompressed data are about 88 GiB.) The archive is split
+into two pieces (`wikihow.data.tar.xz.00` and `wikihow.data.tar.xz.01`). You
+can use `cat` to concatenate them:
+
+```sh
+cat wikihow.data.tar.xz.00 wikihow.data.tar.xz.01 >wikihow.data.tar.xz
+```
+
+The SHA256 chechsums are provided in `wikihow.data.tar.xz.sha256` to check the
+integrity.
 
 To run the script: