diff --git a/readme.txt b/readme.txt
index 81f102f..7116f5d 100644
--- a/readme.txt
+++ b/readme.txt
@@ -44,4 +44,5 @@ Pre-defines
 
    2024-05-24   GOOD R1D with higher power consumption at 30uA
    2024-05-28   GOOD R1D with lower power and TPS shutdown to 0V, yet, TOF range data incorrect. or not ranging at all
+   2024-05-28   range distance same 1000mm
   ******************************************************************************