diff --git a/readme.txt b/readme.txt
index a31d11985..262e24bfc 100644
--- a/readme.txt
+++ b/readme.txt
@@ -75,6 +75,7 @@ Win32-MinGW            - ChibiOS/RT simulator and demo into a WIN32 process,
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 *** 0.6.6 ***
+- FIX: Fixed a problem in the STM32 port USART1 driver.
 - Added the definitions for packed structures to the chtypes.h files.
 - Fixed a problem in the MMC/SD driver in the LPC2148 demo.