diff --git a/readme.txt b/readme.txt
index f9d4ea5d7..80f48a581 100644
--- a/readme.txt
+++ b/readme.txt
@@ -114,6 +114,8 @@
        instead of a simple size.
 - NEW: RT and NIL upgraded to support the enhanced OSLIB.
 - NEW: Memory areas/pointers checker functions added to OSLIB.
+- FIX: Fixed RTC & TAMP interrupts not functional (bug #1260)
+       (backported to 21.11.4).
 - FIX: Fixed syntax errors in STM32H7xx/hal_lld_type2.h (bug #1259)
        (backported to 21.11.4).
 - FIX: Fixed unwanted reset of cache on STM32H7xx (bug #1258)