diff --git a/readme.txt b/readme.txt
index 7c45db6e4..d158be90e 100644
--- a/readme.txt
+++ b/readme.txt
@@ -83,6 +83,8 @@
 *****************************************************************************
 
 *** 2.5.1 ***
+- FIX: Fixed various typos and wrong limits in the STM32F4/F2 HAL driver
+  (bug 3578944)(backported to 2.4.3).
 - FIX: Fixed ARM CMx crt0.c fails at low optimization levels (bug 3578927)
   (backported to 2.4.3).
 - FIX: Fixed compilation issue in chregistry.c (bug 3576776).