diff --git a/src/3x5.ts b/src/3x5.ts
index d3de229..0b1e86b 100644
--- a/src/3x5.ts
+++ b/src/3x5.ts
@@ -44,7 +44,9 @@ const TEXTAREA_STYLE: Partial<CSSStyleDeclaration> = {
   width: "100%",
 };
 
-const fieldInput = document.createElement("textarea");
+const fieldInput = Object.assign(document.createElement("textarea"), {
+  oninput: render,
+});
 Object.assign(fieldInput.style, TEXTAREA_STYLE, { height: "8em" });
 fieldInput.value = String.raw`
 title "Hello, World!"