diff --git a/index.bs b/index.bs
index e5f847486..0ec8dbb66 100644
--- a/index.bs
+++ b/index.bs
@@ -7862,7 +7862,7 @@ The [=remote end steps=] are:
  1. For each enumerable [=own property=] in |parameters|:
     1. Let |key| be the name of the property.
     1. Let |value| be the result of [=getting a property=] named |key| from |parameters|.
-    1. If there is no matching `key` for |key| in |parameters|, return a [=WebDriver error=] with
+    1. If there is no matching `key` for |key| in [=Authenticator Configuration=], return a [=WebDriver error=] with
         [=WebDriver error code=] [=invalid argument=].
     1. If |value| is not one of the `valid values` for that |key|, return a [=WebDriver error=] with [=WebDriver error code=]
         [=invalid argument=].