Update README.md

README.md

@@ -14,11 +14,18 @@ Download the following files into the same directory
 * grocery.py
 * sr27asc files to identify food groups (USDA National Nutrient Database for Standard Reference, Release 27)
 
-Create a .txt file in the same directory listing a URL with the recipe on each line. For example:
+Create a list of urls (a .txt file) in the same directory listing a URL with the recipe on each line. For example:
 ```
 https://thewoksoflife.com/chinese-walnut-cookies/
 https://www.justonecookbook.com/japanese-potato-salad/
 https://tasty.co/recipe/fluffy-jiggly-japanese-cheesecake
 ```
+
+In your command prompt:
+* set your working directory to the folder where you have downloaded the .py and sr27asc files
+* run the the following command `python grocery.py '<listofurls.txt>'`
+
+A listofurls.csv will then be generated in the same directory.
+
 # Sources
 The ingredient parser in this code uses the open source engine at by [schollz](https://schollz.com/blog/ingredients/).