Update README.md

README.md

@@ -29,12 +29,24 @@ The English texts were machine translated back into German. This is how the para
 | **sum**                                                               |.       **21,292,789** |
 
 ## To-do
-- add info how machine translation was done
-- add info about exact size (size per corpus)
-- add copyright info and citations of individual datasets
+- add copyright info of individual datasets
 - add column description
 - upload dataset
 
+## Back translation
+We have made the back translation from English to German with the help of [Fairseq](https://github.com/facebookresearch/fairseq).
+We used the `transformer.wmt19.en-de` model for this purpose:
+
+```python
+en2de = torch.hub.load(
+    "pytorch/fairseq",
+    "transformer.wmt19.en-de",
+    checkpoint_file="model1.pt:model2.pt:model3.pt:model4.pt",
+    tokenizer="moses",
+    bpe="fastbpe",
+)
+```
+
 ## Citations & Acknowledgements
 
 **OpenSubtitles**\