diff --git a/PhyloToL-Part-2.md b/PhyloToL-Part-2.md
index 0c21a96..ed9b2db 100644
--- a/PhyloToL-Part-2.md
+++ b/PhyloToL-Part-2.md
@@ -28,6 +28,14 @@ You will also need to create a 'rules' file. The format here varies between the
 
 _describe rules files here_
 
+Having well-organized ten-digit-codes for sample identification is vital for running the CL, especially clade grabbing, because it will allow the CL to find all sequences belonging to taxa from a specific taxonomic group. For example, in the ten-digit-codes used in the 1000-ReadyToGo file database, in order to clade grab for Opisthokonta the CL will look for all sequences with ten-digit-codes starting with `Op_`, and to clade grab for Metazoa, all ten-digit-codes starting with `Op_me`, etc.
+
+The columns in the rules file are
+
+| Column | Input options | Description |
+| ------------- | ------------- | ------------- | ------------- | ------------- |
+| Target taxa | 
+
 ## Running
 
 To run the CL, use a similar command structure as described for running PhyloToL part 2 above, and add the `--contamination_loop` parameter to activate the contamination loop and specify a mode and the path to a rules file. Available parameters are: