diff --git a/doc/design/compiler-environment-support.md b/doc/design/compiler-environment-support.md
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+# Compiler environment support
+
+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:
+
+ - Rhino
+ - Nashorn
+ - Internet Explorer
+ - ...
+
+**NOTE:** Compiler support does not dictate the runtime requirements of compiled code.
diff --git a/doc/design/compiler-guarantees.md b/doc/design/compiler-guarantees.md
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