diff --git a/README.md b/README.md
index e60881e..199e484 100644
--- a/README.md
+++ b/README.md
@@ -52,7 +52,6 @@ In order to run the full suite of Acceptance tests, run `make testacc`.
 *Note:* Acceptance tests create real resources, and often cost money to run.
 
 ```sh
-export PLAUSIBLE_USERNAME=XXXX
-export PLAUSIBLE_PASSWORD=XXXX
+export PLAUSIBLE_API_KEY=XXXX
 $ make testacc
 ```