diff --git a/src/polyA_classifier/cli.py b/src/polyA_classifier/cli.py
index 5d0e3208b7eea483fc2419868943856519acebf1..6fd9c21714e53038148771a8b6509efdc066247a 100644
--- a/src/polyA_classifier/cli.py
+++ b/src/polyA_classifier/cli.py
@@ -11,6 +11,7 @@ parser.add_argument('-p', '--path', action='store', help='Path to state-dict for
 
 
 def main():
+    """Execute poly(A) classifier from shell."""
     args = parser.parse_args()
 
     if args.data[0] == '[':