Tutorial.md

@@ -99,6 +99,7 @@ python ybyra_apo.py -t example.tre -m example.nex -S
 ```
 
 * Main output: terminals will be ranked according to o the number of different clades resulting from the combination of all trees after the corresponding terminal is removed. The strict consensus will have more politomies when number of combined clades is higher. Terminals that result in fewer combined clades when removed are more likely to be considered 'wildcards' or 'rogue taxa'. Result is printed on the screen (standart output).
+* Rooting trees requires a working installation of Biophython, but it's only needed in the input trees are unrooted or have different roots.
 
 #### character-states are categorized as follows:
 1. Ambiguous synapomorphies (white boxes)