diff --git a/parser.go b/parser.go
index a3166b3..9c1fef9 100644
--- a/parser.go
+++ b/parser.go
@@ -748,6 +748,7 @@ func (p *Parser) tryAssignmentExpression() (*Expression, error) {
 	}
 
 	if *op != Operator_Equals {
+		// TODO: incorrect, evaluates lhs twice
 		operation := getOperation(*op)
 		expr = &Expression{Type: Expression_Binary, Value: BinaryExpression{Left: *lhs, Right: *expr, Operation: operation}, Position: lhs.Position}
 	}