diff --git a/STM32F1/libraries/A_STM32_Examples/keywords.txt b/STM32F1/libraries/A_STM32_Examples/keywords.txt
index e40a099..c553422 100644
--- a/STM32F1/libraries/A_STM32_Examples/keywords.txt
+++ b/STM32F1/libraries/A_STM32_Examples/keywords.txt
@@ -10,3 +10,7 @@
 # Constants (LITERAL1)
 #######################################
 
+OUTPUT_OPEN_DRAIN	LITERAL1
+INPUT_ANALOG	LITERAL1
+INPUT_PULLDOWN	LITERAL1
+PWM	LITERAL1
\ No newline at end of file