diff --git a/demos/AVR/RT-ARDUINO-UNO/Makefile b/demos/AVR/RT-ARDUINO-UNO/Makefile
index b8511dcb7..dd071181c 100644
--- a/demos/AVR/RT-ARDUINO-UNO/Makefile
+++ b/demos/AVR/RT-ARDUINO-UNO/Makefile
@@ -35,7 +35,7 @@ ifeq ($(USE_VERBOSE_COMPILE),)
   USE_VERBOSE_COMPILE = no
 endif
 
-# If enabled, this option makes the build process faster by not compiling
+# If enabled, this option makes the build process faster by not compiling.
 # modules not used in the current configuration.
 ifeq ($(USE_SMART_BUILD),)
   USE_SMART_BUILD = yes