diff --git a/grammar.g4 b/grammar.g4
index c1e7826..187281e 100644
--- a/grammar.g4
+++ b/grammar.g4
@@ -3,8 +3,6 @@ grammar lang ;
 // not always most recent grammar
 // not checked
 
-// TODO
-
 source_file: (statement)+ EOF ;
 
 statement: import
@@ -27,7 +25,7 @@ function_definition: (definietion_info)? (ANNOTATION_INFO)* (constraint ';')*
                      (('=' ( /*prec 2*/ block | (super_expression ';'))) | ';')
                      ;
 
-type_definition: (DEFINITION_INFO)? (ANNOTATION_INFO)* ('^')?
+type_definition: (DEFINITION_INFO)? (ANNOTATION_INFO)* (REFERENCE)?
                  (SIMPLE_TYPE_IDENTIFIER | TYPECLASS_IDENTIFIER)
                  ('[' (TYPECLASS_IDENTIFIER)+ ']')?
                  (ARGUMENT_TYPE_IDENTIFIER)*
@@ -131,7 +129,7 @@ annotated_type: (ANNOTATION_IDENTIFIER)? scoped_type ;
 
 array_type: '[[' type ']]' ;
 
-reference_type: /* prec -1 */ '^' scoped_type ;
+reference_type: /* prec -1 */ REFERENCE scoped_type ;
 
 modified_type: scoped_type ('?' | '!') ;