diff --git a/test/run_time_machine.py b/test/run_time_machine.py
index 6463c42e..c434470f 100755
--- a/test/run_time_machine.py
+++ b/test/run_time_machine.py
@@ -1,6 +1,12 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
+"""
+Test script, for simulating different date and time.
+This is useful for testing the transition from one playlist to another,
+specially when the day_start time is in the night.
+"""
+
 import datetime
 import os
 import sys
diff --git a/test/run_time_warp.py b/test/run_time_warp.py
index 822d72a3..e942ce35 100755
--- a/test/run_time_warp.py
+++ b/test/run_time_warp.py
@@ -1,6 +1,13 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
+"""
+Test script, for simulating speed up the clock.
+With the WARP_FACTOR you can transform a second to a fraction.
+With this functionality it is possible to run a 24 hours playlist in a minute,
+and debug the playlist reader.
+"""
+
 import datetime
 import os
 import sys