Update index.md

Author: WouterVrielink

sort/index.md

@@ -17,7 +17,7 @@ Recall from lecture that we saw a few algorithms for sorting a sequence of numbe
 ## Getting Started
 
 - `cd` to your Programming directory
-- In your terminal window, run `curl -O https://github.com/minprog/cs50x/raw/2021/sort/dist/sort.zip` to download a Zip file of the lab distribution code.
+- In your terminal window, run `curl -OL https://github.com/minprog/cs50x/raw/2021/sort/dist/sort.zip` to download a Zip file of the lab distribution code.
 - In your terminal window, run `unzip sort.zip` to unzip (i.e., decompress) that Zip file.