diff --git a/conf/autopilot/logger.makefile b/conf/autopilot/logger.makefile
index 1845dd204b..680131df66 100644
--- a/conf/autopilot/logger.makefile
+++ b/conf/autopilot/logger.makefile
@@ -50,6 +50,9 @@ ap.srcs += mcu.c
 #set SPI interface for SD card (0 or 1)
 ap.CFLAGS += -DHW_ENDPOINT_LPC2000_SPINUM=$(SPI_CHANNEL)
 
+#LPC2148 USB hw module needs at least 18MHz PCLK
+ap.CFLAGS += -DUSE_USB_HIGH_PCLK
+
 #efsl
 ap.CFLAGS += -I $(SRC_ARCH)/efsl/inc -I $(SRC_ARCH)/efsl/conf
 
diff --git a/sw/airborne/firmwares/logger/main_logger.c b/sw/airborne/firmwares/logger/main_logger.c
index 8f3eea1406..cc23a76b42 100644
--- a/sw/airborne/firmwares/logger/main_logger.c
+++ b/sw/airborne/firmwares/logger/main_logger.c
@@ -100,7 +100,7 @@
 #endif
 
 #ifndef LOG_STOP_KEY
-/* BUTTON that stops logging (BUTTON = P0.7, DTR = P0.13, INT1 = P0.14) */
+/* BUTTON that stops logging (PPM_IN = P0.6, BUTTON = P0.7, DTR = P0.13, INT1 = P0.14) */
 #define LOG_STOP_KEY 7
 #endif