Update README.md

Author: maboa

README.md

@@ -1,5 +1,7 @@
 # transcript-diff
-A small clientside web app based on a diff library, that shows the difference between transcripts.
+A small clientside web app based on a diff library that shows the difference in words between transcripts.
+
+It shows matched, inserted, deleted and replaced words.
 
 This uses a modified version of [jsdifflib](http://github.com/cemerick/jsdifflib)