diff --git a/readme.txt b/readme.txt
index 16e62e6a6..482ddc028 100644
--- a/readme.txt
+++ b/readme.txt
@@ -83,6 +83,8 @@
 *****************************************************************************
 
 *** 2.5.1 ***
+- FIX: Fixed mmc_spi.c won't compile due to misplaced declaration (bug
+  3570035)(backported to 2.4.3).
 - FIX: Fixed problem in STM32F1xx USB driver after revision 4598 (bug 3569374).
 - FIX: Fixed GPIO glitch during PAL initialization (bug 3569347)(backported
   to 2.4.3).