diff --git a/os/hal/include/hal_serial.h b/os/hal/include/hal_serial.h
index 22e86fb70..76352838f 100644
--- a/os/hal/include/hal_serial.h
+++ b/os/hal/include/hal_serial.h
@@ -195,7 +195,7 @@ struct hal_serial_driver {
 #define sdGetTimeout(sdp, t) iqGetTimeout(&(sdp)->iqueue, t)
 
 /**
- * @brief   Direct blocking write to a @p SerialDriver.
+ * @brief   Direct non-blocking write to a @p SerialDriver.
  * @note    This function bypasses the indirect access to the channel and
  *          writes directly to the output queue. This is faster but cannot
  *          be used to write from different channels implementations.
@@ -238,14 +238,14 @@ struct hal_serial_driver {
   oqWriteTimeout(&(sdp)->oqueue, b, n, TIME_IMMEDIATE)
 
 /**
- * @brief   Direct blocking read from a @p SerialDriver.
+ * @brief   Direct non-blocking read from a @p SerialDriver.
  * @note    This function bypasses the indirect access to the channel and
  *          reads directly from the input queue. This is faster but cannot
  *          be used to read from different channels implementations.
  *
  * @iclass
  */
-#define sdReadI(sdp, b, n) iqReadI(&(sdp)->iqueue, b, n, TIME_INFINITE)
+#define sdReadI(sdp, b, n) iqReadI(&(sdp)->iqueue, b, n)
 
 /**
  * @brief   Direct blocking read from a @p SerialDriver.
diff --git a/readme.txt b/readme.txt
index d72a8ce96..6b85b5654 100644
--- a/readme.txt
+++ b/readme.txt
@@ -124,11 +124,13 @@
 - NEW: Increased stacks size in RT test suite from 128 to 192. added an
        option to override the stack size by defining THREADS_STACK_SIZE
        in the makefile.
-- FIX: Virtual timers lockup uder rare conditions (bug #1235)
-       (backported to 20.3.5)(backported to 21.11.2).
-- FIX: STM32 RTCv2 locks for a second (bug #1234)
-       (backported to 20.3.5)(backported to 21.11.2).
-- FIX: CAN support broken on STM32F413 (bug #1232)(***********TODO*********** backported to 21.11.3).
+- FIX: Fixed old bugs in serial driver header (bug #1236)
+       (backported to 20.3.5)(backported to 21.11.3).
+- FIX: Fixed virtual timers lockup uder rare conditions (bug #1235)
+       (backported to 20.3.5)(backported to 21.11.3).
+- FIX: Fixed STM32 RTCv2 locks for a second (bug #1234)
+       (backported to 20.3.5)(backported to 21.11.3).
+- FIX: Fixed CAN support broken on STM32F413 (bug #1232)(***********TODO*********** backported to 21.11.3).
 - FIX: Re-opened and fixed bug #1100
        (backported to 20.3.5)(backported to 21.11.2).
 - FIX: Fixed wrong buffers toggling in STM32 USBv1 isochronous mode (bug #1232)