diff --git a/doc/design/compiler-environment-support.md b/doc/design/compiler-environment-support.md
index 4a85e9d3df..6cd0d6b9db 100644
--- a/doc/design/compiler-environment-support.md
+++ b/doc/design/compiler-environment-support.md
@@ -1,15 +1,23 @@
 # Compiler environment support
 
+**NOTE:** Compiler support does not dictate the runtime requirements of compiled code.
+
+## Supported environments
+
 The Babel compiler is **only** supported in these environments:
 
  - Modern browsers such as Chrome, Firefox, Safari, Edge etc.
  - Node 0.10+
 
-This means that notably Babel does not support the following environments:
+## Unsupported environments
+
+This means that any other environment is not supported, this includes but is not limited
+to:
 
  - Rhino
  - Nashorn
  - Internet Explorer
  - ...
 
-**NOTE:** Compiler support does not dictate the runtime requirements of compiled code.
+**NOTE:** If Babel works in any of the unsupported environments then it is purely
+coincidental has no bearing on future compatibility. Use at your own risk.