Reference.md

@@ -44,7 +44,7 @@ A Snakemake workflow is defined by specifying rules in a Snakefile. Rules decomp
 
 ## Overview
 
-Snakefile in green, output files in yellow, configuration files in white, rules in grey.
+Snakefile in green, set of input/output `wildcard` files in yellow, configuration files in white, rules in grey.
 
 ```mermaid