diff --git a/src/etc/example-char.js b/src/etc/example-char.js
index 3c0fb29d..3d6cc3e8 100644
--- a/src/etc/example-char.js
+++ b/src/etc/example-char.js
@@ -98,4 +98,10 @@ async function showcase(){
     //returns the data if success, null if failed.
     const data = await getState("somedata")
     const anotherdata = await getState("anotherdata")
-}
\ No newline at end of file
+}
+
+
+// --- additional notes
+// the code are parsed everytime, so complex codes would slow down the program.
+// the function must be return in 400ms, or it would be timeout.
+// for security reasons, you can only access limited apis.
\ No newline at end of file