diff --git a/HISTORY.md b/HISTORY.md
index 1ea64208a..6276e77b7 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -22,7 +22,8 @@ Breaking changes:
 - Upgrade to `fraction.js@4.3.7`,
   see <https://github.com/rawify/Fraction.js/issues/68>.
 - Dropped support for JavaScript engines that do not fully support ES6 or
-  `bigint`, or are not actively maintained.
+  `bigint`, or are not actively maintained. ES2020 is now the minimum required
+  EcmaScript version.
 
 Non-breaking changes:
 
diff --git a/README.md b/README.md
index 4936b2ebf..5300f6bff 100644
--- a/README.md
+++ b/README.md
@@ -76,7 +76,7 @@ See the [Getting Started](https://mathjs.org/docs/getting_started.html) for a mo
 
 ## Browser support
 
-Math.js works on any ES6 compatible JavaScript engine, including node.js, Chrome, Firefox, Safari, and Edge.
+Math.js works on any [ES2020](https://262.ecma-international.org/11.0/) compatible JavaScript engine, including node.js, Chrome, Firefox, Safari, and Edge.
 
 
 ## Documentation