diff --git a/readme.txt b/readme.txt
index 2d0271b21..c389ad332 100644
--- a/readme.txt
+++ b/readme.txt
@@ -81,7 +81,7 @@
 - HAL: Added no-DMA mode to the STM32 I2Cv2 driver.
 - HAL: Added DAC support to all STM32 sub-platforms, added another demo for
        the STM32F3xx.
-- HAL: Fixed STM32 USARTv1: incorrect txend2_cb callback behaviour (bug #596).
+- HAL: Fixed STM32 USARTv1: incorrect txend2_cb callback behavior (bug #596).
 - DEM: Fixed wrong comment in ARMCM4-STM32F401RE-NUCLEO demo (bug #595).
 - HAL: Fixed STM32 SDC LLD driver initialization with Asserts disabled
        (bug #594).