diff --git a/README.md b/README.md
index e1501c3..511f594 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,12 @@
 # Paste
 
-This is a pastebin-like, simple file sharing application targeted to run on Cloudflare Worker.  
-[pb.nekoid.cc](http://pb.nekoid.cc) is the current deployment of this project.  
-The maximum upload file size is limited to **10 MB** and the paste will be kept for **28 days** only by default.  
+This project is a fast, anonymous file and text sharing platform built on a serverless architecture with live instance available at [pb.nekoid.cc](https://pb.nekoid.cc), deployed as a Cloudflare Workers, written in Typescript. Originally designed to quickly share logs, configuration files, and even command output with another computer.
+
+This service enables users to quickly and anonymously share files, texts, and URLs with QR Codes and shortened URLs. 
+All the upload files are stored in an object service, which can be any S3-compatible service, like AWS S3. It supports fast file upload
+and fetch via RESTful API, web interface and cURL for console, and caching of frequently accessed files with Cloudflare CDN.
+
+The maximum upload file size is limited to **250 MB** and the paste will be kept for **28 days** only by default.  
 *All data may be deleted or expired without any notification and guarantee.*  
 Please **DO NOT** abuse this service.
 
@@ -30,7 +34,7 @@ It is worth noting that Cloudflare Worker is run *before* the cache. Therefore,
 
 ## Environment variable
 
-|Name|Description|
+|Variable name|Description|
 |-|-|
 |`SERVICE_URL`|Service URL|
 |`PASTE_INDEX_HTML_URL`|Service frontpage HTML URL|
@@ -44,10 +48,11 @@ It is worth noting that Cloudflare Worker is run *before* the cache. Therefore,
 |`LARGE_ENDPOINT`|S3 endpoint to upload *large paste*|
 |`LARGE_DOWNLOAD_ENDPOINT`|S3/CDN endpoint/ to retrieve *large paste*|
 
-(Compatible to any S3-compatible object storage)  
-**`AWS_ACCESS_KEY_ID`, `AWS_SECRET_ACCESS_KEY` and `ENDPOINT` should be kept secret,
-i.e., [encrypted store](https://developers.cloudflare.com/workers/platform/environment-variables/#adding-secrets-via-wrangler)
-.**
+`AWS_ACCESS_*` and `LARGE_AWS_ACCESS_*` is the access credentials to S3-compatible object storages.  
+These environment variable can be set in `wrangler.toml` or using the following command:
+```sh
+$ pnpm wrangler secret put <KEY>
+```
 
 ## Usage
 
@@ -56,13 +61,13 @@ i.e., [encrypted store](https://developers.cloudflare.com/workers/platform/envir
 Upload a file (Raw body) with password enabled
 
 ```sh
-$ curl -g -T ${FILE} -H "x-pass: exmaple1234" "https://pb.nekoid.cc"
+$ curl -g -X POST -T <file-path> -H "x-pass: exmaple1234" "https://pb.nekoid.cc"
 ```
 
 Upload a file (Formdata) with password enabled
 
 ```shell
-$ curl -F u=@exmaple.txt -F "pass=example1234" "https://pb.nekoid.cc"
+$ curl -F u=@<file-path> -F "pass=example1234" "https://pb.nekoid.cc"
 ```
 
 Upload command ouput as paste
@@ -80,13 +85,13 @@ $ echo "Hello, world!" | curl -F u=@- 'https://pb.nekoid.cc?qr=1'
 Get paste
 
 ```shell
-$ curl https://pb.nekoid.cc/uuid
+$ curl https://pb.nekoid.cc/<uuid>
 ```
 
 Delete paste
 
 ```shell
-$ curl -X DELETE https://pb.nekoid.cc/uuid
+$ curl -X DELETE https://pb.nekoid.cc/<uuid>
 ```
 
 ### **Web**
@@ -96,20 +101,20 @@ This HTML form currenly only support paste upload.
 
 ## API Specification
 
-### GET /
+### `GET /`
 
 Fetch the Web frontpage HTML for uploading text/file (used for browsers)
 
-### GET /api
+### `GET /api`
 
 Fetch API specification
 
-### GET /\<uuid\>
+### `GET /<uuid>`
 
 Fetch the paste by uuid. *If the password is set, this request requires additional `x-pass` header or to
 use [HTTP Basic authentication](https://en.wikipedia.org/wiki/Basic_access_authentication).*
 
-### POST /
+### `POST /`
 
 Create new paste. Currently, only `multipart/form-data` and raw request are supported.  
 Add `?qr=1` to enable QR code generation for paste link.
@@ -149,7 +154,44 @@ The request body contains the upload content.
 |`large_paste`|Large paste(>25MB)|
 |`link`|URL link to be redirected|
 
-### GET /\<uuid\>/\<option\>
+#### Response
+
+Upon a successful upload using `POST /` or a call to `GET /<uuid>/settings`, the endpoint will respond in the following format
+
+In default mode, designed for text console:
+```
+uuid: MRFS
+link: https://pb.nekoid.cc/MRFS
+type: paste
+title: satanichia.png
+mime-type: image/png
+size: 2420328 bytes (2.308 MiB)
+password: false
+access times: 5
+max_access_n: -
+created at 2025-08-01T06:59:44.336Z
+expired at 2025-08-29T06:59:44.336Z
+```
+
+In JSON mode (`?json=1`)
+```json
+{
+  "uuid":"MRFS",
+  "link":"https://pb.nekoid.cc/MRFS",
+  "link_qr":"https://qrcode.nekoid.cc/?q=https%3A%2F%2Fpb.nekoid.cc%2FMRFS&type=svg",
+  "type":"paste",
+  "title":"satanichia.png",
+  "mime_type":"image/png",
+  "human_readable_size":"2.308 MiB",
+  "size":2420328,
+  "password":false,
+  "access_n":5,
+  "created":"2025-08-01T06:59:44.336Z",
+  "expired":"2025-08-29T06:59:44.336Z"
+}
+```
+
+### `GET /<uuid>/<option>`
 
 Fetch the paste (code) in rendered HTML with syntax highlighting  
 Add `?qr=1` to enable QR code generation for paste link.  
@@ -164,15 +206,11 @@ Currently, only the following options is supported for `option`
 
 *The authentication requirement is as same as `GET /<uuid>`.*
 
-### DELETE /\<uuid\>
+### `DELETE /<uuid>`
 
 Delete paste by uuid. *If the password is set, this request requires additional `x-pass` header*
 
-### POST /\<uuid\>/settings (Not implemented)
-
-Update paste setting. *If the password is set, this request requires additional `x-pass` header*
-
-### POST /api/large_upload/create
+### `POST /api/large_upload/create`
 
 Generate the presigned URL for upload large paste to the given S3 endpoint `LARGE_ENDPOINT` using HTTP `PUT` request.
 
@@ -189,11 +227,30 @@ Generate the presigned URL for upload large paste to the given S3 endpoint `LARG
 
 The `file-size` and `file-sha256sum` field is required.
 
-### POST /api/large_upload/complete/\<uuid\>
+#### Response
+```json
+{
+  "uuid": "<new-uuid>",
+  "expiration": <expiration-time>,
+  "file_size": <expected-upload-file-size>,
+  "file_hash": "<expected-upload-file-hash>",
+  "signed_url": "<upload-path>",
+  "required_headers": {
+    "Content-Length": "<expected-upload-file-size>",
+    "X-Amz-Content-Sha256": "<expected-upload-file-hash>"
+  }
+}
+```
+
+Then, you can upload the file to `signed_url` using `PUT` method with and only with the headers supplied in `required_headers`. You can find reference code to perform the transection in the [frontend code](https://github.com/rikkaneko/paste/blob/2d7ce3f1c435103b7f676b0b325c1e0036afaded/frontend/static/paste.js#L274).
+
+Note that you can only upload the specific file matching the `file-size` and `file-sha256-hash` provided in `/create` request.
+
+### `POST /api/large_upload/complete/<uuid>`
 
 Finialize the paste created from `/api/large_upload/create`.
 
-### GET /api/large_upload/\<uuid\>
+### `GET /api/large_upload/<uuid>`
 
 Generate the presigned URL for upload large paste to the given S3 endpoint `LARGE_DOWNLOAD_ENDPOINT` using HTTP `GET` request.
 
@@ -203,10 +260,13 @@ S3 object lifecycle rules and Cloudflare KV's expiring key can be used to implem
 Reference for Amazon S3 can be found in [here](https://docs.aws.amazon.com/AmazonS3/latest/userguide/object-lifecycle-mgmt.html)
 , and Blackblaze B2 in [here](https://www.backblaze.com/b2/docs/lifecycle_rules.html).
 
+## Paste API client
+The Paste API client for the command line interface (CLI), as well as versions for Android and iOS, will be available soon. :D
+
 ## Remark
 
 You are welcome to use my project and depoly your own service.  
 Due to the fact that the `SERVICE_URL` is hard-coded into the `paste.html`,
 you may simply use `Ctrl`+`R` to replace `pb.nekoid.cc` with your own service URL.  
 
-### Of course, contribute and report issues are also welcome! \:D
\ No newline at end of file
+Of course, contribute and report issues are also welcome! \:D
\ No newline at end of file
diff --git a/src/api/large_upload.ts b/src/api/large_upload.ts
index 45d7b07..d19c317 100644
--- a/src/api/large_upload.ts
+++ b/src/api/large_upload.ts
@@ -207,7 +207,7 @@ router.post('/complete/:uuid', async (request, env, ctx) => {
   }
 
   const descriptor: PasteIndexEntry = JSON.parse(val);
-  if (descriptor.paste_type == PasteType.large_paste || !descriptor.upload_track?.pending_upload) {
+  if (descriptor.paste_type !== PasteType.large_paste || !descriptor.upload_track?.pending_upload) {
     return new Response('Invalid operation.\n', {
       status: 442,
     });