Update config.yaml

config/config.yaml

@@ -26,6 +26,7 @@
 #=========================================================
 
 # Absolute path of directory where fastq are stored
+# could be a single directory or a list of directory (data/*)
 input_dir: /absolute/path/to/data
 # How mate paires are written in fastq
 input_mate: '_R[12]'