diff --git a/input/JavaScriptLexer.g4 b/input/JavaScriptLexer.g4
index fc3fb56..534d9d3 100644
--- a/input/JavaScriptLexer.g4
+++ b/input/JavaScriptLexer.g4
@@ -140,6 +140,7 @@ In:                             'in';
 Try:                            'try';
 Event:							'event';
 AtToken:						'@';
+Sharable:                       'sharable';
 
 /// Event Semantics
 
diff --git a/input/YJSParser.g4 b/input/YJSParser.g4
index ac3ab32..d8ac949 100644
--- a/input/YJSParser.g4
+++ b/input/YJSParser.g4
@@ -63,6 +63,7 @@ clzOrFunctionDeclaration
 	|functionDeclaration
 	|interfaceDeclaration
 	|eventDeclaration
+	|sharableDeclaration
 	;
 
 interfaceDeclaration
@@ -120,6 +121,17 @@ block
 statementList
     : statement+
     ;
+sharableDeclaration
+    : sharableStatement
+    ;
+
+sharableStatement
+    : sharableModifier variableDeclarationList eos
+    ;
+
+sharableModifier  // let, const - ECMAScript 6
+    : Sharable
+    ;
 
 variableStatement
     : varModifier variableDeclarationList eos
@@ -441,6 +453,7 @@ keyword
     | Protected
     | Static
     | Yield
+    | Sharable
     ;
 
 eos