diff --git a/main.py b/main.py
index 529e193..dd60721 100755
--- a/main.py
+++ b/main.py
@@ -37,6 +37,7 @@ app = application = bottle.Bottle(catchall=False)
 
 ##################################################### Configuration ############################################$
 def get_env(var, default=None):
+    """var is an env var name, default is the value to return if var does not exist. If no default and no value, an exception is raised."""
     if var in os.environ:
         return os.environ[var]
     elif default is not None: