diff --git a/EukPhylo-Part-2:-MSAs,-trees,-and-contamination-loop.md b/EukPhylo-Part-2:-MSAs,-trees,-and-contamination-loop.md
index 40241fc..efda76b 100644
--- a/EukPhylo-Part-2:-MSAs,-trees,-and-contamination-loop.md
+++ b/EukPhylo-Part-2:-MSAs,-trees,-and-contamination-loop.md
@@ -194,7 +194,7 @@ You can also change the tree-building method using the `--cl_tree_method` argume
 
 #### Sisters/subsisters mode
 
-Below are the parameters for running sisters/subsisters. You must give a rules file to EITHER --sister_rules or --subsister_rules, or both.
+Below are the parameters for running sisters/subsisters. You must give a rules file to EITHER `--sister_rules` or `--subsister_rules`, or both.
 
 | Parameter  | Required | Options | Description | Default |
 | ------------- | ------------- | ------------- | ------------- | ------------- |