diff --git a/tests/batt_mon.sh b/tests/batt_mon.sh
index d0586fd..a4aa6ee 100644
--- a/tests/batt_mon.sh
+++ b/tests/batt_mon.sh
@@ -1,3 +1,6 @@
+# Simple script that reads the battery capacity every 30 seconds and logs it to a file
+# Used to measure how long the battery lasts for when idle
+
 while [ 1 ]
 
 do