Update README.md

README.md

@@ -4,8 +4,10 @@ This is a dataset of abbreviations.
 Contains examples of abbreviations and regular words.
 There are two subsets:
 
-- wiki - more accurate, manually annotated dataset. Collected
-  from abbreviations in wiki and words from pronunciation dictionary.
-- kestrel - tokens that are automatically annotated by Google
+- <mark>wiki</mark> - more accurate, manually annotated subset. Collected
+  from abbreviations in wiki and words in CMUdict.
+- <mark>kestrel</mark> - tokens that are automatically annotated by Google
   text normalization into **PLAIN** and **LETTERS** semiotic
-  classes. Less accurate, but bigger
+  classes. Less accurate, but bigger
+  
+  More info on how dataset was collected: [blog](http://balacoon.com/blog/en_us_abbreviation_detection/#difficult-to-pronounce)