readme update

README.md

@@ -74,7 +74,7 @@ Directory tree structure:
 
 ## Usage:
 The scripts all take one mandatory input file that describes your species and their associated data 
-(see example.yml in the "examples" folder of the repository)
+(see example.yml in the "examples" folder of the repository). Every dataset path in this input must be an absolute path.
 
 You must also fill in a "config" file containing sensible variables (galaxy and tripal passwords, etc..) that
 the script will read to create the different services and to access the galaxy container. By default, the config file