diff --git a/src/plugins/filetransfer.ts b/src/plugins/filetransfer.ts
index 85d7844cd..372e20f7e 100644
--- a/src/plugins/filetransfer.ts
+++ b/src/plugins/filetransfer.ts
@@ -107,19 +107,32 @@ export interface FileTransferError {
 
 /**
  * @name Transfer
- * @description This plugin allows you to upload and download files.
- * Example:
+ *
+ * @description
+ * This plugin allows you to upload and download files.
+ *
+ * @usage
+ *
  * Create instance:
+ * ```ts
  * const fileTransfer = new Transfer();
+ * ```
  *
  * Upload a file:
+ * ```ts
  * fileTransfer.upload(..).then(..).catch(..);
+ * ```
  *
  * Download a file:
+ * ```ts
  * fileTransfer.download(..).then(..).catch(..);
+ * ```
  *
  * Abort active transfer:
+ * ```ts
  * fileTransfer.abort();
+ * ```
+ *
  */
 @Plugin({
   plugin: 'cordova-plugin-file-transfer',
@@ -128,11 +141,23 @@ export interface FileTransferError {
 })
 export class Transfer {
 
-  public static FILE_NOT_FOUND_ERR: number = 1;
-  public static INVALID_URL_ERR: number = 2;
-  public static CONNECTION_ERR: number = 3;
-  public static ABORT_ERR: number = 4;
-  public static NOT_MODIFIED_ERR: number = 4;
+  /**
+   * Error code rejected from upload with FileTransferError
+   * Defined in FileTransferError.
+   *      FILE_NOT_FOUND_ERR: 1   Return when file was not found
+   *      INVALID_URL_ERR: 2,     Return when url was invalid
+   *      CONNECTION_ERR: 3,      Return on connection error
+   *      ABORT_ERR: 4,           Return on aborting
+   *      NOT_MODIFIED_ERR: 5     Return on "304 Not Modified" HTTP response
+   * @enum {number}
+   */
+  public static FileTransferErrorCode = {
+    FILE_NOT_FOUND_ERR: 1,
+    INVALID_URL_ERR: 2,
+    CONNECTION_ERR: 3,
+    ABORT_ERR: 4,
+    NOT_MODIFIED_ERR: 5
+  };
 
   private _objectInstance: any;
 
@@ -146,7 +171,7 @@ export class Transfer {
    * @param {string} fileUrl  Filesystem URL representing the file on the device or a data URI. For backwards compatibility, this can also be the full path of the file on the device.
    * @param {string} url  URL of the server to receive the file, as encoded by encodeURI().
    * @param {FileUploadOptions} options  Optional parameters.
-   * @param {boolean} trustAllHosts: Optional parameter, defaults to false. If set to true, it accepts all security certificates. This is useful since Android rejects self-signed security certificates. Not recommended for production use. Supported on Android and iOS.
+   * @param {boolean} trustAllHosts  Optional parameter, defaults to false. If set to true, it accepts all security certificates. This is useful since Android rejects self-signed security certificates. Not recommended for production use. Supported on Android and iOS.
    * @return Returns a Promise that resolves to a FileUploadResult and rejects with FileTransferError.
    */
   @CordovaInstance({