diff --git a/doc/playground.md b/doc/playground.md
index 0d59c6a264..00151d2cd2 100644
--- a/doc/playground.md
+++ b/doc/playground.md
@@ -12,6 +12,8 @@ Playground is a proving ground for **possible** ES7 proposals.
 to5.transform("code", { playground: true });
 ```
 
+**NOTE:** Enabling `playground` also enables [experimental support](usage.md#experimental).
+
 ## Features
 
  * [Memoization operator](#memoization-operator)