diff --git a/src/ems.h b/src/ems.h
index 573e57f77..b6bdaab44 100644
--- a/src/ems.h
+++ b/src/ems.h
@@ -173,6 +173,8 @@ typedef struct {
 #define COLOR_MAGENTA "\x1B[0;35m"
 #define COLOR_CYAN "\x1B[0;36m"
 #define COLOR_WHITE "\x1B[0;37m"
+#define COLOR_BOLD_ON "\x1B[1m"   // 1
+#define COLOR_BOLD_OFF "\x1B[21m" // 21
 
 // function definitions
 extern void ems_parseTelegram(uint8_t * telegram, uint8_t len);