:wrench: fix code frame

diff --git a/docs/lang/basic.md b/docs/lang/basic.md
index cd2d424..b68deaa 100644 (file)
--- a/docs/lang/basic.md
+++ b/docs/lang/basic.md
@@ -6,7 +6,10 @@
 #include <cstdio>
 #include <iostream>
 
-int main() { return 0; }
+int main() {
+  // do something...
+  return 0;
+}
 ```
 
 ??? note "什么是 include？"