diff --git a/tv/tuner/1.0/types.hal b/tv/tuner/1.0/types.hal
index 891ecf6bea..5a6273042c 100644
--- a/tv/tuner/1.0/types.hal
+++ b/tv/tuner/1.0/types.hal
@@ -1954,7 +1954,7 @@ safe_union DemuxPid {
 };
 
 @export
-enum Constant : uint16_t {
+enum Constant : uint32_t {
     /**
      * An invalid packet ID in transport stream according to ISO/IEC 13818-1.
      */
@@ -1963,6 +1963,14 @@ enum Constant : uint16_t {
      * An invalid Stream ID.
      */
     INVALID_STREAM_ID = 0xFFFF,
+    /**
+     * An invalid Filter ID.
+     */
+    INVALID_FILTER_ID = 0xFFFFFFFF,
+    /**
+     * An invalid AV sync hardware ID.
+     */
+    INVALID_AV_SYNC_ID = 0xFFFFFFFF,
 };
 
 /**
@@ -2181,19 +2189,37 @@ struct DemuxFilterDownloadSettings {
  */
 struct DemuxIpAddress {
     safe_union SrcIpAddress {
+        /**
+         * 0.0.0.0 is invalid. should be ignored.
+         */
         uint8_t[4] v4;
 
+        /**
+         * 0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0 is invalid. should be ignored.
+         */
         uint8_t[16] v6;
     } srcIpAddress;
 
     safe_union DstIpAddress {
+        /**
+         * 0.0.0.0 is invalid. should be ignored.
+         */
         uint8_t[4] v4;
 
+        /**
+         * 0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0 is invalid. should be ignored.
+         */
         uint8_t[16] v6;
     } dstIpAddress;
 
+    /**
+     * 0 is invalid. should be ignored.
+     */
     uint16_t srcPort;
 
+    /**
+     * 0 is invalid. should be ignored.
+     */
     uint16_t dstPort;
 };