diff --git a/README.rst b/README.rst
index 396c89c3..93eb8750 100644
--- a/README.rst
+++ b/README.rst
@@ -54,11 +54,13 @@ Found in requirements.txt
 
 Tests
 =====
-To run the tests, run `python tests.py`. Three environment variables must be set:
+To run the tests, run `python tests.py`. Two additional environment variables must be set:
+
+* TRELLO_TOKEN: the Trello OAuth token for the user whose boards you will access
+* TRELLO_TEST_BOARD_COUNT: the number of boards in your Trello account 
+
+One environment variable is optional:
 
-* TRELLO_API_KEY: your Trello API key  
-* TRELLO_TOKEN: your Trello OAuth token  
-* TRELLO_TEST_BOARD_COUNT: the number of boards in your Trello account  
 * TRELLO_TEST_BOARD_NAME: name of the board to test card manipulation on. Must be unique, or the first match will be used
 
 And run (from `py-trello/`):