diff --git a/README.md b/README.md
index ee316a8..395fbba 100644
--- a/README.md
+++ b/README.md
@@ -26,6 +26,25 @@ results must be scraped by year.  Changing the year in the URLs alters the resul
 Powerball: https://www.lotto.net/powerball/numbers/1992  
 Mega Millions: https://www.lotto.net/mega-millions/numbers/1996
 
+## Environment Variables
+
+To facilitate environment variables for testing or execution, create a .env file in the root folder of
+the project and add the following lines to it:
+
+DATABASE_URL="sqlite:///predictor.db"  
+POWERBALL_INCEPTION="1992"  
+MEGA_MILLIONS_INCEPTION="1996"  
+BASE_SCRAPE_URL="https://www.lotto.net/"  
+TARGET_CONTAINER="div"  
+TARGET_CLASS="archive-container"  
+BALL_CLASS="ball ball"  
+POWERBALL_CLASS="ball powerball"  
+MEGABALL_CLASS="ball mega-ball"  
+POWERBALL_MULTIPLIER_CLASS="ball power-play"  
+MEGA_MILLIONS_MULTIPLIER_CLASS="ball megaplier"  
+DATE_CLEAN_REGEX="r'(st|nd|rd|th)'"  
+DATE_INPUT_FORMAT="%B %d %Y"
+
 ## TO-DOs
 
 1. Review standard tests for sqlalchemy objects