diff --git a/packages/babel-register/README.md b/packages/babel-register/README.md
index a72e2fb003..e54797d852 100644
--- a/packages/babel-register/README.md
+++ b/packages/babel-register/README.md
@@ -68,7 +68,10 @@ require("@babel/register")({
   extensions: [".es6", ".es", ".jsx", ".js", ".mjs"],
 
   // Setting this to false will disable the cache.
-  cache: true
+  cache: true,
+
+  // Specify the version of babel-core used for transformation. (Optional)
+  babel: require('babel-core')
 });
 ```