diff --git a/update.sh b/update.sh
index ba8c7c1..431a903 100644
--- a/update.sh
+++ b/update.sh
@@ -49,6 +49,9 @@ fi
 if [[ ! -f modules/custom_scheduler.py ]]; then
     cp -n etc/custom_scheduler.py modules/
     printf "\nCustom scheduler template copied to modules/custom_scheduler.py\n"
+elif ! cmp -s modules/custom_scheduler.py etc/custom_scheduler.py; then
+    echo "Warning: modules/custom_scheduler.py differs from the template in etc/custom_scheduler.py."
+    echo "If you want to see the differences, run: diff etc/custom_scheduler.py modules/custom_scheduler.py"
 fi
 
 # Backup the data/ directory