diff --git a/3-NeuralNetworks/04-OwnFramework/README.md b/3-NeuralNetworks/04-OwnFramework/README.md
index 35124c94..d80634b5 100644
--- a/3-NeuralNetworks/04-OwnFramework/README.md
+++ b/3-NeuralNetworks/04-OwnFramework/README.md
@@ -56,7 +56,7 @@ The gradient descent algorithm would remain the same, but it would be more diffi
Note that the left-most part of all those expressions is the same, and thus we can effectively calculate derivatives starting from the loss function and going "backwards" through the computational graph. Thus the method of training a multi-layered perceptron is called **backpropagation**, or 'backprop'.
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> TODO: image citation