diff --git a/lib/index.js b/lib/index.js
index ed872d8..6207dcf 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -29,7 +29,7 @@ const DEFAULTS = {
  *
  * @name imageToAscii
  * @function
- * @param {String} source The path/url to the image.
+ * @param {String|Buffer} source The path/url to the image or a Buffer object.
  * @param {Object|String} options The path to the image or an object containing
  * the following fields:
  *