Update README.md

README.md

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 ## Danish Compounds
 
-Danish Compounds consists of a list of Danish compound words as well as an annotation of how they were split. This can be used to evaluate how close a model can obtain similar splits.
+Danish Compounds consists of a list of Danish compound words annotated for constituent words and
+interfixed. This can be used to evaluate how close a model can obtain similar splits.
 
 ## Loading the dataset
 
@@ -85,6 +86,9 @@ This dataset was initially annotated to get a gist of how well BPE, Unigram, and
 
 ![image/png](https://cdn-uploads.huggingface.co/production/uploads/5ff5943752c26e9bc240bada/tdTHo4W-_36-1U1gSR8CI.png)
 
+> The Jaccard index, also sometimes called the Jaccard similarity, can be seen as a similarity metric
+between the labeled splits and the splits of the model.
+
 It was annotated as a part of Kenneth Enevoldsen's master thesis. 
 
 ## Citation