diff --git a/features.txt b/features.txt
index 09f65a7f89f29f3ee334719110dc203bdf882c8b..b6e73c239476c18d46a016906ecb9805cefb4d45 100644
--- a/features.txt
+++ b/features.txt
@@ -65,6 +65,8 @@ Array.prototype.flatMap
 # Includes all tests for:
 # String.prototype.{trimStart, trimEnd, trimLeft, trimRight }
 string-trimming
+String.prototype.trimEnd
+String.prototype.trimStart
 
 # Standard language features
 #