diff --git a/index.d.ts b/index.d.ts
index 71c3f80..2f739d9 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -17,7 +17,7 @@ declare namespace Logger {
 
   export interface Record {
     id: number
-    meta: any
+    meta: Logger.Meta
     name: string
     type: Logger.Type
     level: number
@@ -25,6 +25,8 @@ declare namespace Logger {
     timestamp: number
   }
 
+  export interface Meta {}
+
   export interface Target {
     /**
      * - 0: no color support
diff --git a/src/shared.ts b/src/shared.ts
index 921b281..0d42dff 100644
--- a/src/shared.ts
+++ b/src/shared.ts
@@ -140,7 +140,7 @@ class Logger {
   }
 
   extend = (namespace: string) => {
-    return new Logger(`${this.name}:${namespace}`)
+    return new Logger(`${this.name}:${namespace}`, this.meta)
   }
 
   warning = (format: any, ...args: any[]) => {