1 files changed, 14 insertions, 0 deletions
diff --git a/docs/source/about/introduction.rst b/docs/source/about/introduction.rst
index 02c627a..ff01d3d 100644
--- a/docs/source/about/introduction.rst
+++ b/docs/source/about/introduction.rst
@@ -1,6 +1,20 @@
 前言
 ====
 
+.. code-block:: nivis
+
+    if: contained!(event.message, r"Hello") => p", World!" ? false;
+
+
+.. code-block:: rust
+
+    fn main() {
+        println!("Hello, world!");
+    }
+
+
+:issue:`23`
+
 在开始之前
 ----------------------------