diff --git a/README.md b/README.md
index b5a2e8e38..5d276da8e 100644
--- a/README.md
+++ b/README.md
@@ -311,6 +311,22 @@ $feedId = $createFeedResult->getFeedId();
 If you are manipulating huge feed documents you can pass to `upload()` anything that Guzzle can turn into a stream.
 
 
+### Uploading with a specific charset
+
+```php
+$charset = "Shift-JIS";
+...
+// Create feed document
+$createFeedDocSpec = new Feeds\CreateFeedDocumentSpecification([
+    'content_type' => SellingPartnerApi\Document::withContentType($feedType['contentType'], $charset)]
+]);
+...
+// Upload feed contents to document
+...
+$docToUpload->upload($feedContents, $charset);
+```
+
+
 ## Downloading a feed result document
 
 This works very similarly to downloading a report document:
diff --git a/lib/Document.php b/lib/Document.php
index c2d48238e..be2defb77 100644
--- a/lib/Document.php
+++ b/lib/Document.php
@@ -245,13 +245,14 @@ public function downloadStream($output = null): StreamInterface {
      * Uploads data to the document specified in the constructor.
      *
      * @param string|resource|StreamInterface|callable|\Iterator $feedData The contents of the feed to be uploaded
+     * @param string $charset An optional charset for the document to upload
      *
      * @return void
      */
-    public function upload($feedData): void {
+    public function upload($feedData, string $charset = 'utf-8'): void {
         $response = $this->client->put($this->url, [
             RequestOptions::HEADERS => [
-                "content-type" => $this->contentType,
+                "content-type" => self::withContentType($this->contentType, $charset),
                 "host" => parse_url($this->url, PHP_URL_HOST),
             ],
             RequestOptions::BODY => $feedData,
@@ -275,4 +276,16 @@ public function __destruct() {
             unlink($this->tempFilename);
         }
     }
+
+    /**
+     * Create a normalized content-type header.
+     * When uploading a document you must use the exact same content-type/charset in createFeedDocument() and upload().
+     *
+     * @param string $contentType
+     * @param string $charset
+     * @return string
+     */
+    public static function withContentType(string $contentType, string $charset = 'utf-8'): string {
+        return "{$contentType}; charset={$charset}";
+    }
 }