diff --git a/src/Ast.hs b/src/Ast.hs
index 2220efe..6253aa6 100644
--- a/src/Ast.hs
+++ b/src/Ast.hs
@@ -55,6 +55,8 @@ data Expression
   | BooleanLiteral Bool
   | NullLiteral
   | Reference Identifier
+  | LocalVariable Identifier
+  | FieldVariable Identifier
   | BinaryOperation BinaryOperator Expression Expression
   | UnaryOperation UnaryOperator Expression
   | StatementExpressionExpression StatementExpression