diff --git a/packages/vant/src/tab/README.md b/packages/vant/src/tab/README.md
index 9cc5f5a57..ef46f81bf 100644
--- a/packages/vant/src/tab/README.md
+++ b/packages/vant/src/tab/README.md
@@ -57,7 +57,7 @@ import { ref } from 'vue';
 
 export default {
   setup() {
-    const activeName = ref('a');
+    const activeName = ref('b');
     return { activeName };
   },
 };
diff --git a/packages/vant/src/tab/README.zh-CN.md b/packages/vant/src/tab/README.zh-CN.md
index 89e0dae1c..beccba8de 100644
--- a/packages/vant/src/tab/README.zh-CN.md
+++ b/packages/vant/src/tab/README.zh-CN.md
@@ -60,7 +60,7 @@ import { ref } from 'vue';
 
 export default {
   setup() {
-    const activeName = ref('a');
+    const activeName = ref('b');
     return { activeName };
   },
 };