diff --git a/dart.html.markdown b/dart.html.markdown
index e94f1203..291f6764 100644
--- a/dart.html.markdown
+++ b/dart.html.markdown
@@ -693,7 +693,6 @@ example33() {
 /// Dart has also added feature such as Null aware operators
 var isBool = true;
 var hasString = isBool ?? "default String";
-var hasValue ??= "default Value";
 
 /// Programs have only one entry point in the main function.
 /// Nothing is expected to be executed on the outer scope before a program