diff --git a/features.txt b/features.txt
index 328fa2312d..09f65a7f89 100644
--- a/features.txt
+++ b/features.txt
@@ -60,6 +60,12 @@ SharedArrayBuffer
 Array.prototype.flatten
 Array.prototype.flatMap
 
+# String Trimming
+# https://github.com/tc39/proposal-string-left-right-trim
+# Includes all tests for:
+# String.prototype.{trimStart, trimEnd, trimLeft, trimRight }
+string-trimming
+
 # Standard language features
 #
 # Language features that have been included in a published version of the