Update file phylo_exercise.md

exercises/phylo_exercise.md

@@ -169,9 +169,11 @@
 
     You can find more info on the implemented models here: http://www.iqtree.org/doc/Substitution-Models#dna-models
 
-* Inspect the phylogeny using **Figtree** - download it from https://github.com/rambaut/figtree/releases if you have not already done so. You should be able to open the .tre file directly via the SFTP feature of your terminal client. 
+* The actual tree in Newik format will be stored in the .treefile. 
 
-* When opening the .tre file, Figtree will ask you to give a label to the node values. These are your bootstrap values. You can choose display them under "Node Labels".
+* Inspect the phylogeny using **Figtree** - download it from https://github.com/rambaut/figtree/releases if you have not already done so. You should be able to open the .treefile directly via the SFTP feature of your terminal client. 
+
+* When opening the .treefile, Figtree will ask you to give a label to the node values. These are your bootstrap values. You can choose display them under "Node Labels".
 
 * In figtree, root the tree using the oldest sequence.