diff --git a/README.md b/README.md
index 9fbeb82..5db2ac7 100644
--- a/README.md
+++ b/README.md
@@ -101,6 +101,7 @@ Options can be passed into the Signature class as a fifth parameter, below is a
 | expires           | +6 hours    | Request expiration time, specified in relative time format or in seconds. min: 1 (+1 second), max: 604800 (+7 days) |
 | valid_prefix      |             | Server will check that the filename starts with this prefix and fail with a AccessDenied 403 if not. |
 | content_type      |             | Strictly only allow a single content type, blank will allow all. Will fail with a AccessDenied 403 is this condition is not met. |
+| content_type_starts_with |      | If the content_type option (above) is blank, then this option allows a range of content types, through starts-with ([#30](/eddturtle/direct-upload/issues/30)) (added in v3.1). |
 | encryption        | false       | Sets whether AWS server side encryption should be applied to the uploaded files, so that files will be encrypted with AES256 when at rest. Should be a true or false bool. |
 | custom_url        | null        | Allow S3 compatible solutions by specifying the domain it should POST to. Must be a valid url (inc. http/https) otherwise will throw InvalidOptionException. |
 | accelerate        | false       | Set Amazon S3 Transfer Acceleration - more info @ [http://amzn.to/2xKblKe](http://amzn.to/2xKblKe). Should be a true or false bool. |
diff --git a/src/Options.php b/src/Options.php
index 663b355..6307a53 100644
--- a/src/Options.php
+++ b/src/Options.php
@@ -49,6 +49,10 @@ class Options
         // with a AccessDenied 403 is this condition is not met.
         'content_type' => '',
 
+        // If the content_type option (above) is blank, then this option allows a range of
+        // content types, through starts-with #30.
+        'content_type_starts_with' => '',
+
         // Sets whether AWS server side encryption should be applied to the uploaded files,
         // so that files will be encrypted with AES256 when at rest.
         'encryption' => false,
diff --git a/src/Signature.php b/src/Signature.php
index 3401d76..f881029 100644
--- a/src/Signature.php
+++ b/src/Signature.php
@@ -269,13 +269,29 @@ protected function generatePolicy(): void
         $this->base64Policy = base64_encode(json_encode($policy));
     }
 
+    /**
+     * Build the content-type part of the policy. It can change based on options given to it.
+     *
+     * @return array [0 => the type to restriction, eq or starts-with, 1 => the content-type header, 2 => the value]
+     */
     private function getPolicyContentTypeArray(): array
     {
+        // Prefix = 1st item of the array, eq is exact, starts-with is... starts with ;)
         $contentTypePrefix = (empty($this->options->get('content_type')) ? 'starts-with' : 'eq');
+
+        // Pass the content_type option (for exact) or content_type_starts_with for starts with matching
+        if (!empty($this->options->get('content_type'))) {
+            $contentTypeValue = $this->options->get('content_type');
+        } else if (!empty($this->options->get('content_type_starts_with'))) {
+            $contentTypeValue = $this->options->get('content_type_starts_with');
+        } else {
+            $contentTypeValue = '';
+        }
+
         return [
             $contentTypePrefix,
             '$Content-Type',
-            $this->options->get('content_type')
+            $contentTypeValue
         ];
     }
 
diff --git a/tests/OptionsTest.php b/tests/OptionsTest.php
index 68520ee..ae1010f 100644
--- a/tests/OptionsTest.php
+++ b/tests/OptionsTest.php
@@ -10,12 +10,13 @@ class OptionsTest extends TestCase
     public function testGetOptions()
     {
         $options = (new Options())->getOptions();
-        $this->assertTrue(count($options) === 11);
+        $this->assertTrue(count($options) === 12);
         $this->assertArrayHasKey('success_status', $options);
         $this->assertArrayHasKey('acl', $options);
         $this->assertArrayHasKey('default_filename', $options);
         $this->assertArrayHasKey('max_file_size', $options);
         $this->assertArrayHasKey('expires', $options);
         $this->assertArrayHasKey('valid_prefix', $options);
+        $this->assertArrayHasKey('content_type', $options);
     }
 }