Update README.md

README.md

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 ## Intro
 
+This is the code for [this](https://youtu.be/4eIBisqx9_g) video on Youtube by Siraj Raval
+
 [![Build Status](https://travis-ci.org/thtrieu/darkflow.svg?branch=master)](https://travis-ci.org/thtrieu/darkflow) [![codecov](https://codecov.io/gh/thtrieu/darkflow/branch/master/graph/badge.svg)](https://codecov.io/gh/thtrieu/darkflow)
 
 Real-time object detection and classification. Paper: [version 1](https://arxiv.org/pdf/1506.02640.pdf), [version 2](https://arxiv.org/pdf/1612.08242.pdf).
@@ -275,3 +277,7 @@ flow --pbLoad built_graph/yolo.pb --metaLoad built_graph/yolo.meta --imgdir samp
 If you'd like to load a `.pb` and `.meta` file when using `return_predict()` you can set the `"pbLoad"` and `"metaLoad"` options in place of the `"model"` and `"load"` options you would normally set.
 
 That's all.
+
+## Credits
+
+Credits for this code go to [https://github.com/thtrieu](https://github.com/thtrieu). I've merely created a wrapper to get people started.