README.md in ruby-dnn-1.1.1 vs README.md in ruby-dnn-1.1.2

@@ -93,9 +93,11 @@
 | Pooling | MaxPool2D, AvgPool2D, GlobalAvgPool2D, UnPool2D |
 | Optimizers | SGD, Nesterov, AdaGrad, RMSProp, AdaDelta, RMSPropGraves, Adam, AdaBound |
 | Losses | MeanSquaredError, MeanAbsoluteError, Hinge, HuberLoss, SoftmaxCrossEntropy, SigmoidCrossEntropy |
 
 ## Datasets
+By setting the environment variable "RUBY_DNN_DOWNLOADS_PATH", you can specify the path to read dataset.
+
 ● Iris  
 ● MNIST  
 ● Fashion-MNIST  
 ● CIFAR-10  
 ● CIFAR-100