diff --git a/audio/7.0/IStreamOutEventCallback.hal b/audio/7.0/IStreamOutEventCallback.hal
index 4de767f..8ef0060 100644
--- a/audio/7.0/IStreamOutEventCallback.hal
+++ b/audio/7.0/IStreamOutEventCallback.hal
@@ -51,6 +51,25 @@
      * "has-atmos", int32
      * "audio-encoding", int32
      *
+     * S (audio HAL 7.0) in addition adds the following keys:
+     * "presentation-id", int32
+     * "program-id", int32
+     * "presentation-content-classifier", int32
+     *    presentation-content-classifier key values can be referenced from
+     *    frameworks/base/media/java/android/media/AudioPresentation.java
+     *    i.e AudioPresentation.ContentClassifier
+     *    It can contain any of the below values
+     *    CONTENT_UNKNOWN   = -1,
+     *    CONTENT_MAIN      =  0,
+     *    CONTENT_MUSIC_AND_EFFECTS = 1,
+     *    CONTENT_VISUALLY_IMPAIRED = 2,
+     *    CONTENT_HEARING_IMPAIRED  = 3,
+     *    CONTENT_DIALOG = 4,
+     *    CONTENT_COMMENTARY = 5,
+     *    CONTENT_EMERGENCY = 6,
+     *    CONTENT_VOICEOVER = 7
+     * "presentation-language", string  // represents ISO 639-2 (three letter code)
+     *
      * Parceling Format:
      * All values are native endian order. [1]
      *
diff --git a/memtrack/aidl/android/hardware/memtrack/IMemtrack.aidl b/memtrack/aidl/android/hardware/memtrack/IMemtrack.aidl
index 18587ee..e78d4d7 100644
--- a/memtrack/aidl/android/hardware/memtrack/IMemtrack.aidl
+++ b/memtrack/aidl/android/hardware/memtrack/IMemtrack.aidl
@@ -30,6 +30,22 @@
  * GL, graphics, etc. All memory sizes must be in real memory usage,
  * accounting for stride, bit depth, rounding up to page size, etc.
  *
+ * The following getMemory() categories are important for memory accounting in
+ * `dumpsys meminfo` and should be reported as described below:
+ *
+ * - MemtrackType::GRAPHICS and MemtrackRecord::FLAG_SMAPS_UNACCOUNTED
+ *     This should report the PSS of all DMA buffers mapped by the process
+ *     with the specified PID. This PSS can be calculated using ReadDmaBufPss()
+ *     form libdmabufinfo.
+ *
+ * - MemtrackType::GL and MemtrackRecord::FLAG_SMAPS_UNACCOUNTED
+ *     This category should report all GPU private allocations for the specified
+ *     PID that are not accounted in /proc/<pid>/smaps.
+ *
+ * - MemtrackType::OTHER and MemtrackRecord::FLAG_SMAPS_UNACCOUNTED
+ *     Any other memory not accounted for in /proc/<pid>/smaps if any, otherwise
+ *     this should return 0.
+ *
  * Constructor for the interface should be used to perform memtrack management
  * setup actions and must be called once before any calls to getMemory().
  */
@@ -76,7 +92,10 @@
      * This information is used to identify GPU devices for GPU specific
      * memory accounting (e.g. DMA buffer usage).
      *
+     * The device name(s) provided in getGpuDeviceInfo() must match the
+     * device name in the corresponding device(s) sysfs entry.
+     *
      * @return vector of DeviceInfo populated for all GPU devices.
      */
-     DeviceInfo[] getGpuDeviceInfo();
+    DeviceInfo[] getGpuDeviceInfo();
 }