diff --git a/doc/Classes/File.md b/doc/Classes/File.md
new file mode 100644
index 0000000..e1b42ca
--- /dev/null
+++ b/doc/Classes/File.md
@@ -0,0 +1,50 @@
+# File
+
+**Namespace**: `\ParagonIE\Halite`
+
+## Methods
+
+### `checksum()`
+
+> `public static` checksum(`$filepath`, [`AuthenticationKey`](Symmetric/AuthenticationKey.md) `$key = null`, `$raw = false`) : `string`
+
+Calculates a BLAKE2b-512 hash of the given file.
+
+* `$filepath` - Path to a file (or an open file handle)
+* `$key` (optional)
+* `$raw` - Set to `TRUE` if you don't want a hexadecimal string returned
+
+### `encrypt()`
+
+> `public static` encrypt(`$input`, `$output`, [`EncryptionKey`](Symmetric/EncryptionKey.md) `$key`) : `string`
+
+
+
+### `decrypt()`
+
+> `public static` decrypt(`$input`, `$output`, [`EncryptionKey`](Symmetric/EncryptionKey.md) `$key`) : `string`
+
+
+
+
+### `seal()`
+
+> `public static` seal(`$input`, `$output`, [`EncryptionPublicKey`](Asymmetric/EncryptionPublicKey.md) `$key`) : `string`
+
+
+
+### `unseal()`
+
+> `public static` unseal(`$input`, `$output`, [`EncryptionSecretKey`](Asymmetric/EncryptionSecretKey.md) `$key`) : `string`
+
+
+
+### `sign()`
+
+> `public static` sign(`$input`, [`SignatureSecretKey`](Asymmetric/SignatureSecretKey.md) `$key`, `boolean $raw_binary`) : `string`
+
+
+
+### `verify()`
+
+> `public static` sign(`$input`, [`SignaturePublicKey`](Asymmetric/SignaturePublicKey.md) `$key`, `string $signature`, `boolean $raw_binary`) : `boolean`
\ No newline at end of file
diff --git a/src/File.php b/src/File.php
index cf32fcd..666b44f 100644
--- a/src/File.php
+++ b/src/File.php
@@ -194,6 +194,7 @@ public static function sign(
      * 
      * @param string|resource $filename
      * @param SignaturePublicKey $publickey
+     * @param string $signature
      * @param bool $raw_binary
      * 
      * @return string
@@ -201,6 +202,7 @@ public static function sign(
     public static function verify(
         $filename,
         KeyInterface $publickey,
+        $signature,
         $raw_binary = false
     ) {
         if (
@@ -210,6 +212,7 @@ public static function verify(
             return self::verifyStream(
                 new ReadOnlyFile($filename),
                 $publickey,
+                $signature,
                 $raw_binary
             );
         }