diff --git a/os/common/ports/ARMCMx/chcore_v6m.c b/os/common/ports/ARMCMx/chcore_v6m.c
index 5e43cb01a..b68e97eb4 100644
--- a/os/common/ports/ARMCMx/chcore_v6m.c
+++ b/os/common/ports/ARMCMx/chcore_v6m.c
@@ -104,8 +104,6 @@ void PendSV_Handler(void) {
 
 /**
  * @brief   IRQ epilogue code.
- *
- * @param[in] lr        value of the @p LR register on ISR entry
  */
 void _port_irq_epilogue(void) {
   struct port_extctx *ctxp;
diff --git a/readme.txt b/readme.txt
index d8d022a21..7cff28c1c 100644
--- a/readme.txt
+++ b/readme.txt
@@ -160,6 +160,7 @@
 - EX:  Updated LIS302DL to 1.1.0 (backported to 18.2.1).
 - EX:  Updated LPS25H to 1.1.0 (backported to 18.2.1).
 - EX:  Updated LSM303DLHC to 1.1.0 (backported to 18.2.1).
+- HAL: Fixed broken functionality of MFS module (bug #986).
 - RT:  Fixed GCC6 problem breaks Cortex-M0 port (bug #985).
 - NIL: Fixed scheduler misbehaving in rare cases (bug #983)
        (backported to 18.2.2 and 17.6.5).