diff --git a/drivers/serial/usbtty.c b/drivers/serial/usbtty.c
index 148d1a6..8e08153 100644
--- a/drivers/serial/usbtty.c
+++ b/drivers/serial/usbtty.c
@@ -971,8 +971,8 @@
 		/*
 		 * is_usbd_high_speed routine needs to be defined by
 		 * specific gadget driver
-		 * It returns TRUE if device enumerates at High speed
-		 * Retuns FALSE otherwise
+		 * It returns true if device enumerates at High speed
+		 * Retuns false otherwise
 		 */
 		for (i = 0; i < NUM_ENDPOINTS; i++) {
 			if (((ep_descriptor_ptrs[i]->bmAttributes &