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+++ b/README.md
@@ -14,6 +14,8 @@ A PyTorch implementation for paper *[Unsupervised Domain Adaptation by Backpropa
 
 ## Note
 
+Before running the training code, make sure that `DATASETDIR` is set to dataset directory.
+
 - `MNISTmodel()`
     - basically the same network structure as proposed in the paper, expect for adding dropout layer in feature extractor
     - large gap exsits between with and w/o dropout layer