diff --git a/packages/babel-helper-fixtures/README.md b/packages/babel-helper-fixtures/README.md
index 59018bdec7..d487b7ba49 100644
--- a/packages/babel-helper-fixtures/README.md
+++ b/packages/babel-helper-fixtures/README.md
@@ -1,5 +1,7 @@
 # babel-helper-fixtures
 
+**NOTE:** This is an internal Babel module and may not work outside. Use at your own risk.
+
 ## Usage
 
 ```javascript
diff --git a/packages/babel-helper-plugin-test-runner/README.md b/packages/babel-helper-plugin-test-runner/README.md
index 3cc45bb899..6e75d3799e 100644
--- a/packages/babel-helper-plugin-test-runner/README.md
+++ b/packages/babel-helper-plugin-test-runner/README.md
@@ -1 +1,3 @@
 # babel-helper-plugin-test-runner
+
+**NOTE:** This is an internal Babel module and may not work outside. Use at your own risk.
diff --git a/packages/babel-helper-transform-fixture-test-runner/README.md b/packages/babel-helper-transform-fixture-test-runner/README.md
index 104c784eaf..4ec929b0a3 100644
--- a/packages/babel-helper-transform-fixture-test-runner/README.md
+++ b/packages/babel-helper-transform-fixture-test-runner/README.md
@@ -1,5 +1,7 @@
 # babel-helper-transform-fixture-test-runner
 
+**NOTE:** This is an internal Babel module and may not work outside. Use at your own risk.
+
 ## Usage
 
 ```javascript