diff --git a/features.txt b/features.txt
index abfde8e562df5d7bdcb9d6be823b501af78be026..62201f2d473bc2c1fc1a558bc6dd412f349e575a 100644
--- a/features.txt
+++ b/features.txt
@@ -7,6 +7,10 @@
 #
 # https://github.com/tc39/process-document
 
+# BigInt
+# https://github.com/tc39/proposal-bigint
+BigInt
+
 # Promise.prototype.finally
 # https://github.com/tc39/proposal-promise-finally
 Promise.prototype.finally