diff --git a/bin/3.1_create_gtf/Modules/Ensembl/GTFGen.py b/bin/3.1_create_gtf/Modules/Ensembl/GTFGen.py
index 0e3af56..eaf88f6 100644
--- a/bin/3.1_create_gtf/Modules/Ensembl/GTFGen.py
+++ b/bin/3.1_create_gtf/Modules/Ensembl/GTFGen.py
@@ -18,7 +18,7 @@ def __init__(self, organism, release, wd, data_dir):
         # input_parameter: organism = input organism
         #                  release  = used Ensembl release
         #                  wd       = working directory (default is "."), this is used if data_dir is not specified.
-        #                  data_dir = data directory (if specified this is used)
+        #                  data_dir = data directory (if specified this is used instead of wd)
 
         self.gff_lines = self.get_organism_as_gff(organism, release, wd, data_dir)