diff --git a/src/index.js b/src/index.js
index a1ef267..23320ac 100644
--- a/src/index.js
+++ b/src/index.js
@@ -220,6 +220,7 @@ function tokenize(input) {
     };
     console.log(input + ", result: ");
     console.log(thenDo(input_matchee_pair, integer));
+    // TODO: id, string, space, basic operator, 3 marks: @, {, }.
 }
 exports.tokenize = tokenize;
 tokenize("+123");
diff --git a/src/index.ts b/src/index.ts
index bcd3e10..e22fdbb 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -242,6 +242,7 @@ export function tokenize(input : string){
     }
     console.log(input+", result: ");
     console.log(thenDo(input_matchee_pair, integer));
+    // TODO: id, string, space, basic operator, 3 marks: @, {, }.
 
 }