diff --git a/README.md b/README.md
index 8b8f1a0..ee642e3 100644
--- a/README.md
+++ b/README.md
@@ -309,8 +309,10 @@ sets a white background, be able to make it also flash with a red background.
 * Write an alarm app which set an RTC alarm to vibrate the watch.
 * Write a timer app with countdown and lap functionality.
 * Implement a battery saving mode activated on low batterie (ie <= 10 %).
-    * This mode would turn bluetooth off
-    * This mode would set the screen brightness to 50 %
+    * This mode would :
+        * turn bluetooth off.
+        * set the screen brightness to 50 %.
+        * throttle the MCU frequency down to 80 or 40 Mhz.
 
 
 ## Done List :