diff --git a/src/index.js b/src/index.js
index <HASH>..<HASH> 100644
--- a/src/index.js
+++ b/src/index.js
@@ -208,10 +208,19 @@ Vision.prototype.annotate = function(requests, callback) {
  *     // Error handling omitted.
  *   }
  *
- *   vision.detect(image, function(err, detection, apiResponse) {});
+ *   vision.detect(image, types, function(err, detection, apiResponse) {});
  * });
  *
  * //-
+ * // If you have a base64 string, provide it in a Buffer.
+ * //-
+ * var myBase64ImageRepresentation = '...';
+ *
+ * var image = new Buffer(myBase64ImageRepresentation, 'base64');
+ *
+ * vision.detect(image, types, function(err, detection, apiResponse) {});
+ *
+ * //-
  * // Supply multiple images for feature detection.
  * //-
  * var images = [
vision: docs: show base<I> usage (#<I>)