diff --git a/CHANGELOG.md b/CHANGELOG.md
index 63778f77..ba6ca8be 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+5.5.0 / 2026/xx/xx
+------------------
+
+* デフォルトの User Agent に、summaly の readme へのリンクを含めるようにしました。
+* 現在お使いの summaly のバージョンを export するように
+
 5.4.0 / 2026/05/11
 ------------------
 * テキストのデコードに `TextDecoder` を使用するように
diff --git a/README.md b/README.md
index 129b1e27..389738a8 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,8 @@ summaly
 [![][himawari-badge]][himasaku]
 [![][sakurako-badge]][himasaku]
 
+Get summary of web page.
+
 Installation
 ----------------------------------------------------------------
 ```
@@ -49,7 +51,7 @@ npm run serve
 | **followRedirects**       | *boolean*              | Whether follow redirects                                                                                                                                                            | `true`                 |
 | **plugins**               | *plugin[]* (see below) | Custom plugins                                                                                                                                                                      | `null`                 |
 | **agent**                 | *Got.Agents*           | Custom HTTP agent (see below)                                                                                                                                                       | `null`                 |
-| **userAgent**             | *string*               | User-Agent for the request                                                                                                                                                          | `SummalyBot/[version]` |
+| **userAgent**             | *string*               | User-Agent for the request                                                                                                                                                          | `SummalyBot/[version] (+[Link to README file in GitHub])` |
 | **responseTimeout**       | *number*               | Set timeouts for each phase, such as host name resolution and socket communication.                                                                                                 | `20000`                |
 | **operationTimeout**      | *number*               | Set the timeout from the start to the end of the request.                                                                                                                           | `60000`                |
 | **contentLengthLimit**    | *number*               | If set to true, an error will occur if the content-length value returned from the other server is larger than this parameter (or if the received body size exceeds this parameter). | `10485760`             |
diff --git a/src/index.ts b/src/index.ts
index e0f94950..14761ff7 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -72,6 +72,8 @@ export const summalyDefaultOptions = {
 	plugins: [],
 } as SummalyOptions;
 
+export const version = _VERSION_;
+
 /**
  * Summarize an web page
  */
diff --git a/src/utils/got.ts b/src/utils/got.ts
index eaa9e55c..3fd2b407 100644
--- a/src/utils/got.ts
+++ b/src/utils/got.ts
@@ -29,7 +29,7 @@ export type GotOptions = {
 export const DEFAULT_RESPONSE_TIMEOUT = 20 * 1000;
 export const DEFAULT_OPERATION_TIMEOUT = 60 * 1000;
 export const DEFAULT_MAX_RESPONSE_SIZE = 10 * 1024 * 1024;
-export const DEFAULT_BOT_UA = `SummalyBot/${_VERSION_}`;
+export const DEFAULT_BOT_UA = `SummalyBot/${_VERSION_} (+https://github.com/misskey-dev/summaly/blob/master/README.md)`;
 
 export function getGotOptions(url: string, opts?: GeneralScrapingOptions): Omit<GotOptions, 'method'> {
 	return {