diff --git a/scripts/matrix_to_ideogram_annots.py b/scripts/matrix_to_ideogram_annots.py
index 4bd45de4..7f327d57 100755
--- a/scripts/matrix_to_ideogram_annots.py
+++ b/scripts/matrix_to_ideogram_annots.py
@@ -239,7 +239,7 @@ def get_clusters_meta(names, paths):
     ap.add_argument('--infercnv_output',
                     help='Path to pre_vis_transform.txt output from inferCNV')
     ap.add_argument('--infercnv_delimiter',
-                    help='Delimiter in pre_vis_transform.txt output from inferCNV',
+                    help='Delimiter in pre_vis_transform.txt output from inferCNV.  Default: \\t',
                     default='\t')
     ap.add_argument('--gen_pos_file',
                     help='Path to gen_pos.txt genomic positions file from inferCNV ')