diff --git a/.env.test b/.env.test
index 5abea97a14..0833c82074 100644
--- a/.env.test
+++ b/.env.test
@@ -35,6 +35,3 @@ OPENID_REFRESH_TOKEN="dummy-refresh-token"
 ACTIVE_RECORD_ENCRYPTION_PRIMARY_KEY="test_primary_key"
 ACTIVE_RECORD_ENCRYPTION_DETERMINISTIC_KEY="test_deterministic_key"
 ACTIVE_RECORD_ENCRYPTION_KEY_DERIVATION_SALT="test_derivation_salt"
-
-# Let the tests know if they are run within a Docker container:
-# DOCKER="true"
diff --git a/docker/README.md b/docker/README.md
index be161f6518..6a621eba2f 100644
--- a/docker/README.md
+++ b/docker/README.md
@@ -5,7 +5,7 @@ Docker is intended to provide a common virtual environment available to all deve
 ## Limitations
 1. The docker environment can't directly control your host system browser, which means that browser specs (under `/spec/system/`) and email previews will not work. You may be able to find a solution with [this article](https://evilmartians.com/chronicles/system-of-a-test-setting-up-end-to-end-rails-testing). If so, please contribute!
 
-2. You can try circumventing this by setting the option `DOCKER=true` on the `.env.test file`, which will disable the `sandbox` mode for Chrome, used for system tests.
+2. You can try circumventing this by setting the option `DOCKER=true` on the `.env.test.local` file, which will disable the `sandbox` mode for Chrome, used for system tests.
 
 ## Installing Docker
 ### Requirements