diff --git a/README.md b/README.md
index d2a7372c..27d4f37d 100644
--- a/README.md
+++ b/README.md
@@ -1,17 +1,17 @@
-# Hello middleware for Hono
+# Sentry middleware for Hono
 
-An example project of the third-party middleware for [Hono](https://github.com/honojs/hono).
-This middleware add `X-Message` header to the Response.
+Sentry middleware for [Hono](https://github.com/honojs/hono).
+This middleware sends captured exceptions to the Sentry data source named by the `SENTRY_DSN` environment variable via [toucan-js](https://github.com/robertcepa/toucan-js).
 
 ## Usage
 
 ```ts
-import { hello } from '@honojs/hello'
+import { sentry } from '@honojs/sentry'
 import { Hono } from 'hono'
 
 const app = new Hono()
 
-app.use('*', hello('Hello!! Hono!!'))
+app.use('*', sentry())
 app.get('/', (c) => c.text('foo'))
 
 export default app
@@ -21,12 +21,12 @@ export default app
 
 ```ts
 import { serve } from 'https://deno.land/std/http/server.ts'
-import { hello } from 'https://deno.land/x/hono_hello/mod.ts'
+import { sentry } from 'https://deno.land/x/hono_sentry/mod.ts'
 import { Hono } from 'https://deno.land/x/hono/mod.ts'
 
 const app = new Hono()
 
-app.use('*', hello('Hello!! Hono!!'))
+app.use('*', sentry())
 app.get('/', (c) => c.text('foo'))
 
 serve(app.fetch)
diff --git a/deno_dist/README.md b/deno_dist/README.md
index d2a7372c..27d4f37d 100644
--- a/deno_dist/README.md
+++ b/deno_dist/README.md
@@ -1,17 +1,17 @@
-# Hello middleware for Hono
+# Sentry middleware for Hono
 
-An example project of the third-party middleware for [Hono](https://github.com/honojs/hono).
-This middleware add `X-Message` header to the Response.
+Sentry middleware for [Hono](https://github.com/honojs/hono).
+This middleware sends captured exceptions to the Sentry data source named by the `SENTRY_DSN` environment variable via [toucan-js](https://github.com/robertcepa/toucan-js).
 
 ## Usage
 
 ```ts
-import { hello } from '@honojs/hello'
+import { sentry } from '@honojs/sentry'
 import { Hono } from 'hono'
 
 const app = new Hono()
 
-app.use('*', hello('Hello!! Hono!!'))
+app.use('*', sentry())
 app.get('/', (c) => c.text('foo'))
 
 export default app
@@ -21,12 +21,12 @@ export default app
 
 ```ts
 import { serve } from 'https://deno.land/std/http/server.ts'
-import { hello } from 'https://deno.land/x/hono_hello/mod.ts'
+import { sentry } from 'https://deno.land/x/hono_sentry/mod.ts'
 import { Hono } from 'https://deno.land/x/hono/mod.ts'
 
 const app = new Hono()
 
-app.use('*', hello('Hello!! Hono!!'))
+app.use('*', sentry())
 app.get('/', (c) => c.text('foo'))
 
 serve(app.fetch)
diff --git a/deno_dist/index.ts b/deno_dist/index.ts
index e6f18bf8..1e620330 100644
--- a/deno_dist/index.ts
+++ b/deno_dist/index.ts
@@ -1,8 +1,19 @@
 import type { Handler } from 'https://raw.githubusercontent.com/honojs/hono/v2.0.6/deno_dist/mod.ts'
+import Toucan from 'toucan-js'
 
-export const hello = (message: string = 'Hello'): Handler => {
+export const hello = (): Handler => {
   return async (c, next) => {
-    await next()
-    c.res.headers.append('X-Message', message)
+    const sentry = new Toucan({
+      dsn: c.env.SENTRY_DSN,
+      request: c.req,
+      allowedHeaders: ['user-agent'],
+      allowedSearchParams: /(.*)/,
+    })
+
+    try {
+      await next()
+    } catch (error) {
+      sentry.captureException(error)
+    }
   }
 }