diff --git a/tracetools_launch/trace.py b/tracetools_launch/trace.py
index 156af97..b260e43 100644
--- a/tracetools_launch/trace.py
+++ b/tracetools_launch/trace.py
@@ -1,3 +1,4 @@
+"""Module for the Trace action."""
 
 import os
 from typing import List