Full functionality.

repl.py

@@ -2,7 +2,8 @@ import reader
 import sys
 
 def main():
-	print("Welcome message.")
+	print("Welcome to the lisp interpreter! REPL expression results will be stored in an output file, output.txt by default. This can be overridden by passing an argument to the program.\n"
+		  "Enter (quit) to exit the program. Supported functionality includes mathematical operations, conditional statements, variables, user-defined functions, logical operations, and list manipulation.")
 	outputfile = "output.txt" if len(sys.argv) == 1 else sys.argv[1]
 	interpreter = reader.Reader(outputfile)
 	# REPL Loop