diff --git a/readme.md b/readme.md
index 7edde03..144a361 100644
--- a/readme.md
+++ b/readme.md
@@ -31,8 +31,9 @@ record<
 	version:string,
 	lexer_rules:list<
 		record<
-			type:string,
-			parameters:map<string,any>
+			pattern:string,
+			name:(null|string),
+			?pass:boolean
 		>
 	>,
 	parser_rules:list<
@@ -52,6 +53,7 @@ record<
 ```
 
 where:
+- `version` should be `"2"`
 - `parser_start` is one of the parser rule `label` values.
 - `lexer_rules.*.type` is one of `ignore`, `void`, `boolean`, `int`, `float`, `string` (see section _Lexer rule types_)
 - `parser_rules.*.conclusion.*.type` is one of `terminal`, `variable` (see section _Conclusion element types_)