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@@ -1,7 +1,11 @@
 # LMS-DB-ETL
 An Extract, Transform, Load app to gather book information from public API for a POC LMS project
 
+Environmental Variables:
+`GOOGLE_API_KEY` - API Key required for using the Google Books API
+
 ## extract.py
+The extract.py file contains functions to pull data related to books from different APIs.
 
 ## transform.py