diff --git a/media/java/android/media/tv/tuner/filter/Filter.java b/media/java/android/media/tv/tuner/filter/Filter.java
index f0f576e90d917..5d71a13bf7012 100644
--- a/media/java/android/media/tv/tuner/filter/Filter.java
+++ b/media/java/android/media/tv/tuner/filter/Filter.java
@@ -159,7 +159,8 @@ public class Filter implements AutoCloseable {
     public @interface Status {}
 
     /**
-     * The status of a filter that the data in the filter buffer is ready to be read.
+     * The status of a filter that the data in the filter buffer is ready to be read. It can also be
+     * used to know the STC (System Time Clock) ready status if it's PCR filter.
      */
     public static final int STATUS_DATA_READY = DemuxFilterStatus.DATA_READY;
     /**
diff --git a/media/java/android/media/tv/tuner/filter/MmtpRecordEvent.java b/media/java/android/media/tv/tuner/filter/MmtpRecordEvent.java
index 58a81d99ff99e..c8bb178253af4 100644
--- a/media/java/android/media/tv/tuner/filter/MmtpRecordEvent.java
+++ b/media/java/android/media/tv/tuner/filter/MmtpRecordEvent.java
@@ -55,7 +55,7 @@ public class MmtpRecordEvent extends FilterEvent {
     }
 
     /**
-     * Gets data size in bytes of filtered data.
+     * Gets the record data offset from the beginning of the record buffer.
      */
     @BytesLong
     public long getDataLength() {
diff --git a/media/java/android/media/tv/tuner/filter/TsRecordEvent.java b/media/java/android/media/tv/tuner/filter/TsRecordEvent.java
index bf2c000cb6e8a..12ea222463569 100644
--- a/media/java/android/media/tv/tuner/filter/TsRecordEvent.java
+++ b/media/java/android/media/tv/tuner/filter/TsRecordEvent.java
@@ -71,7 +71,7 @@ public class TsRecordEvent extends FilterEvent {
     }
 
     /**
-     * Gets data size in bytes of filtered data.
+     * Gets the record data offset from the beginning of the record buffer.
      */
     @BytesLong
     public long getDataLength() {
diff --git a/media/java/android/media/tv/tuner/frontend/FrontendStatus.java b/media/java/android/media/tv/tuner/frontend/FrontendStatus.java
index 582e4f54e2c38..0527a1a5642ec 100644
--- a/media/java/android/media/tv/tuner/frontend/FrontendStatus.java
+++ b/media/java/android/media/tv/tuner/frontend/FrontendStatus.java
@@ -645,6 +645,8 @@ public class FrontendStatus {
     }
     /**
      * Gets the current Automatic Gain Control value which is normalized from 0 to 255.
+     *
+     * Larger AGC values indicate it is applying more gain.
      */
     public int getAgc() {
         if (mAgc == null) {
@@ -663,6 +665,10 @@ public class FrontendStatus {
     }
     /**
      * Gets the current Error information by layer.
+     *
+     * The order of the vectors is in ascending order of the required CNR (Contrast-to-noise ratio).
+     * The most robust layer is the first. For example, in ISDB-T, vec[0] is the information of
+     * layer A. vec[1] is the information of layer B.
      */
     @NonNull
     public boolean[] getLayerErrors() {
@@ -736,6 +742,10 @@ public class FrontendStatus {
      *
      * <p>This query is only supported by Tuner HAL 1.1 or higher. Use
      * {@link TunerVersionChecker#getTunerVersion()} to check the version.
+     *
+     * The order of the vectors is in ascending order of the required CNR (Contrast-to-noise ratio).
+     * The most robust layer is the first. For example, in ISDB-T, vec[0] is the information of
+     * layer A. vec[1] is the information of layer B.
      */
     @NonNull
     public int[] getBers() {
@@ -752,6 +762,10 @@ public class FrontendStatus {
      *
      * <p>This query is only supported by Tuner HAL 1.1 or higher. Use
      * {@link TunerVersionChecker#getTunerVersion()} to check the version.
+     *
+     * The order of the vectors is in ascending order of the required CNR (Contrast-to-noise ratio).
+     * The most robust layer is the first. For example, in ISDB-T, vec[0] is the information of
+     * layer A. vec[1] is the information of layer B.
      */
     @NonNull
     @FrontendSettings.InnerFec
@@ -849,6 +863,10 @@ public class FrontendStatus {
      *
      * <p>This query is only supported by Tuner HAL 1.1 or higher. Use
      * {@link TunerVersionChecker#getTunerVersion()} to check the version.
+     *
+     * The order of the vectors is in ascending order of the required CNR (Contrast-to-noise ratio).
+     * The most robust layer is the first. For example, in ISDB-T, vec[0] is the information of
+     * layer A. vec[1] is the information of layer B.
      */
     @NonNull
     @FrontendInterleaveMode
@@ -867,6 +885,10 @@ public class FrontendStatus {
      *
      * <p>This query is only supported by Tuner HAL 1.1 or higher. Use
      * {@link TunerVersionChecker#getTunerVersion()} to check the version.
+     *
+     * The order of the vectors is in ascending order of the required CNR (Contrast-to-noise ratio).
+     * The most robust layer is the first. For example, in ISDB-T, vec[0] is the information of
+     * layer A. vec[1] is the information of layer B.
      */
     @NonNull
     @IntRange(from = 0, to = 0xff)
@@ -900,6 +922,10 @@ public class FrontendStatus {
      *
      * <p>This query is only supported by Tuner HAL 1.1 or higher. Use
      * {@link TunerVersionChecker#getTunerVersion()} to check the version.
+     *
+     * The order of the vectors is in ascending order of the required CNR (Contrast-to-noise ratio).
+     * The most robust layer is the first. For example, in ISDB-T, vec[0] is the information of
+     * layer A. vec[1] is the information of layer B.
      */
     @NonNull
     @FrontendModulation
diff --git a/media/java/android/media/tv/tuner/frontend/ScanCallback.java b/media/java/android/media/tv/tuner/frontend/ScanCallback.java
index f61bd525beb4a..cb35edb15c624 100644
--- a/media/java/android/media/tv/tuner/frontend/ScanCallback.java
+++ b/media/java/android/media/tv/tuner/frontend/ScanCallback.java
@@ -28,7 +28,12 @@ import android.annotation.SystemApi;
 @SystemApi
 public interface ScanCallback {
 
-    /** Scan locked the signal. */
+    /**
+     * Scan locked the signal.
+     *
+     * It can also be notified after signal is locked if the signal attributes transmission
+     * parameter of the signal is changed (e.g., Modulation).
+     */
     void onLocked();
 
     /** Scan stopped. */