diff --git a/jass/__main__.py b/jass/__main__.py
index be37ec20c3ca9146d473ce0a035b749037e97bb7..5797104832415ab808d54886eef27731b456cf87 100644
--- a/jass/__main__.py
+++ b/jass/__main__.py
@@ -348,13 +348,14 @@ def get_parser():
 
     parser_clean_pd = subparsers.add_parser(
         "clean-project-data",
-        help="compute joint statistics and generate plots for a given set of phenotypes",
+        help="Remove old projects that haven't been accessed recently",
     )
     parser_clean_pd.add_argument(
         "--max-days-without-access",
         type=int,
         default=30,
-        help="Every project not access within the provided amount of days will be removed",
+        help="A project is marked for deletion if the number of days elapsed since "
+             "the last access is greater than the amount provided.",
     )
     parser_clean_pd.set_defaults(func=w_clean_project_data)