diff --git a/dump1090.h b/dump1090.h
index c9c7d9c..b7eb1ab 100644
--- a/dump1090.h
+++ b/dump1090.h
@@ -153,7 +153,7 @@ typedef enum {
  * (Earlier values are higher priority)
  */
 typedef enum {
-    ADDR_ADSB_ICAO,    /* ADS-B, ICAO address, transponder sourced */
+    ADDR_ADSB_ICAO,    /* Mode S or ADS-B, ICAO address, transponder sourced */
     ADDR_ADSB_ICAO_NT, /* ADS-B, ICAO address, non-transponder */
     ADDR_ADSR_ICAO,    /* ADS-R, ICAO address */
     ADDR_TISB_ICAO,    /* TIS-B, ICAO address */
diff --git a/mode_s.c b/mode_s.c
index d3d5650..ff51cee 100644
--- a/mode_s.c
+++ b/mode_s.c
@@ -1361,7 +1361,7 @@ static const char *speed_source_to_string(speed_source_t speed) {
 static const char *addrtype_to_string(addrtype_t type) {
     switch (type) {
     case ADDR_ADSB_ICAO:
-        return "ADS-B";
+        return "Mode S / ADS-B";
     case ADDR_ADSB_ICAO_NT:
         return "ADS-B, non-transponder";
     case ADDR_ADSB_OTHER: