diff --git a/src/pifmrds/rds.h b/src/pifmrds/rds.h
index 42f8b88..2a412e3 100644
--- a/src/pifmrds/rds.h
+++ b/src/pifmrds/rds.h
@@ -21,12 +21,17 @@
 #ifndef RDS_H
 #define RDS_H
 
-//taken from bartek's MicroRDS https://github.com/barteqcz/MicroRDS/blob/main/src/rds.h#L30
+//taken from bartek's MicroRDS https://github.com/barteqcz/MicroRDS/blob/main/src/rds.h
 #define DI_STEREO	(1 << 0) /* 1 - Stereo */
 #define DI_AH		(1 << 1) /* 2 - Artificial Head */
 #define DI_COMPRESSED	(1 << 2) /* 4 - Compressed */
 #define DI_DPTY		(1 << 3) /* 8 - Dynamic PTY */
 
+#define AF_CODE_FILLER		205
+#define AF_CODE_NO_AF		224
+#define AF_CODE_NUM_AFS_BASE	AF_CODE_NO_AF
+#define AF_CODE_LFMF_FOLLOWS	250
+
 #include <stdint.h>
 
 extern void get_rds_samples(float *buffer, int count, int stereo, int ct_clock_enabled, float sample_volume);