Update README.md

README.md

@@ -52,6 +52,13 @@ $ python3 absinth.py
 $ python3 absinth.py -t
 ```
 
+Absinth produces individual clustering files for every target. To merge the 
+output files, simple call merge.py
+
+```
+$ python3 merge.py
+```
+
 ## Built With
 
 * [NetworkX](https://networkx.github.io/) - Graph implementation