diff --git a/README.md b/README.md
index c930b42..08fcf78 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ Contest data is provided by [OI-contest-fetch](https://github.com/hanyixuanten/O
 
 - Adds an **Upcoming OI Contests** widget to the WordPress dashboard.
 - Provides a **vblg OI Contest Schedule** block for posts and pages.
-- Keeps the `[oi_contest_schedule]` shortcode available for compatibility and templates.
+- Keeps the `[oics_oi_contest_schedule]` shortcode available for compatibility and templates.
 - Shows contest platform, title, start and end times, and a live countdown.
 - Identifies contests that are currently running.
 - Supports responsive and compact layouts.
@@ -49,7 +49,7 @@ The block is rendered dynamically, so contest data remains current without editi
 For classic editors or templates, the shortcode remains available:
 
 ```text
-[oi_contest_schedule]
+[oics_oi_contest_schedule]
 ```
 
 The shortcode accepts the following attributes:
diff --git a/README_zh.md b/README_zh.md
index c4205cb..cfa19c0 100644
--- a/README_zh.md
+++ b/README_zh.md
@@ -10,7 +10,7 @@ vblg OI Contest Schedule 是一款轻量级 WordPress 插件，可在 WordPress
 
 - 在 WordPress 仪表盘中添加“即将到来的 OI 赛事”小组件。
 - 提供“**OI 赛事日程**”区块，可直接插入文章或页面。
-- 保留 `[oi_contest_schedule]` 短代码，兼容经典编辑器和模板。
+- 保留 `[oics_oi_contest_schedule]` 短代码，兼容经典编辑器和模板。
 - 展示比赛平台、标题、开始和结束时间，以及实时倒计时。
 - 自动标记正在进行的比赛。
 - 支持响应式布局和紧凑布局。
@@ -49,7 +49,7 @@ vblg OI Contest Schedule 是一款轻量级 WordPress 插件，可在 WordPress
 经典编辑器或模板仍可使用以下短代码：
 
 ```text
-[oi_contest_schedule]
+[oics_oi_contest_schedule]
 ```
 
 短代码支持以下属性：
diff --git a/includes/class-plugin.php b/includes/class-plugin.php
index 8edb279..0365527 100644
--- a/includes/class-plugin.php
+++ b/includes/class-plugin.php
@@ -21,7 +21,7 @@ final class OICS_Plugin {
 		add_action( 'wp_dashboard_setup', array( $this, 'register_dashboard_widget' ) );
 		add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_frontend_assets' ) );
 		add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_admin_assets' ) );
-		add_shortcode( 'oi_contest_schedule', array( $this, 'render_shortcode' ) );
+		add_shortcode( 'oics_oi_contest_schedule', array( $this, 'render_shortcode' ) );
 	}
 
 	public function register_block() {
@@ -89,7 +89,7 @@ final class OICS_Plugin {
 
 	public function enqueue_frontend_assets() {
 		$post = get_post();
-		if ( ! $post || ( ! has_shortcode( $post->post_content, 'oi_contest_schedule' ) && ! has_block( 'oics/contest-schedule', $post ) ) ) {
+		if ( ! $post || ( ! has_shortcode( $post->post_content, 'oics_oi_contest_schedule' ) && ! has_block( 'oics/contest-schedule', $post ) ) ) {
 			return;
 		}
 
diff --git a/readme.txt b/readme.txt
index 2019dda..b2460ed 100644
--- a/readme.txt
+++ b/readme.txt
@@ -33,7 +33,7 @@ Add the **vblg OI Contest Schedule** block from the block inserter. Its settings
 
 The shortcode remains available for classic editors and templates. By default it displays up to 10 contests:
 
-`[oi_contest_schedule]`
+`[oics_oi_contest_schedule]`
 
 Use `limit` to display between 1 and 50 contests:
 
@@ -91,7 +91,7 @@ Service and data source:
 
 * Added the upcoming contest dashboard widget.
 * Added the **vblg OI Contest Schedule** editor block with limit and compact layout settings.
-* Added the `[oi_contest_schedule]` shortcode with `limit` and `compact` options.
+* Added the `[oics_oi_contest_schedule]` shortcode with `limit` and `compact` options.
 * Added visitor-local time formatting and live countdowns.
 * Added platform styling and responsive layouts.
 * Added five-minute transient caching for the contest feed.