diff --git a/wifi/aidl/aidl_api/android.hardware.wifi/current/android/hardware/wifi/RttResult.aidl b/wifi/aidl/aidl_api/android.hardware.wifi/current/android/hardware/wifi/RttResult.aidl
index 9c6ad267f3..10c96749c9 100644
--- a/wifi/aidl/aidl_api/android.hardware.wifi/current/android/hardware/wifi/RttResult.aidl
+++ b/wifi/aidl/aidl_api/android.hardware.wifi/current/android/hardware/wifi/RttResult.aidl
@@ -63,4 +63,6 @@ parcelable RttResult {
   byte r2iTxLtfRepetitionCount;
   long ntbMinMeasurementTime;
   long ntbMaxMeasurementTime;
+  byte numTxSpatialStreams;
+  byte numRxSpatialStreams;
 }
diff --git a/wifi/aidl/android/hardware/wifi/RttResult.aidl b/wifi/aidl/android/hardware/wifi/RttResult.aidl
index ab9abb550e..438bc0a0a8 100644
--- a/wifi/aidl/android/hardware/wifi/RttResult.aidl
+++ b/wifi/aidl/android/hardware/wifi/RttResult.aidl
@@ -148,11 +148,15 @@ parcelable RttResult {
     /**
      * Multiple transmissions of HE-LTF symbols in an HE (I2R) Ranging NDP. An HE-LTF repetition
      * value of 1 indicates no repetitions.
+     *
+     * Note: A required field for IEEE 802.11az result.
      */
     byte i2rTxLtfRepetitionCount;
     /**
      * Multiple transmissions of HE-LTF symbols in an HE (R2I) Ranging NDP. An HE-LTF repetition
      * value of 1 indicates no repetitions.
+     *
+     * Note: A required field for IEEE 802.11az result.
      */
     byte r2iTxLtfRepetitionCount;
     /**
@@ -168,6 +172,8 @@ parcelable RttResult {
      * |RttResult.timestamp|.
      *
      * Reference: IEEE Std 802.11az-2022 spec, section 9.4.2.298 Ranging Parameters element.
+     *
+     * Note: A required field for IEEE 802.11az result.
      */
     long ntbMinMeasurementTime;
     /**
@@ -183,6 +189,22 @@ parcelable RttResult {
      * non-TB ranging negotiation.
      *
      * Reference: IEEE Std 802.11az-2022 spec, section 9.4.2.298 Ranging Parameters element.
+     *
+     * Note: A required field for IEEE 802.11az result.
      */
     long ntbMaxMeasurementTime;
+    /**
+     * Number of transmit space-time streams used. Value is in the range 1 to 8.
+     *
+     * Note: Maximum limit is ultimately defined by the number of antennas that can be supported.
+     * A required field for IEEE 802.11az result.
+     */
+    byte numTxSpatialStreams;
+    /**
+     * Number of receive space-time streams used. Value is in the range 1 to 8.
+     *
+     * Note: Maximum limit is ultimately defined by the number of antennas that can be supported.
+     * A required field for IEEE 802.11az result.
+     */
+    byte numRxSpatialStreams;
 }
diff --git a/wifi/aidl/default/aidl_struct_util.cpp b/wifi/aidl/default/aidl_struct_util.cpp
index 836ce1a9b6..0f0c77e171 100644
--- a/wifi/aidl/default/aidl_struct_util.cpp
+++ b/wifi/aidl/default/aidl_struct_util.cpp
@@ -2995,6 +2995,8 @@ bool convertLegacyVectorOfRttResultToAidl(
         aidl_result.r2iTxLtfRepetitionCount = 0;
         aidl_result.ntbMinMeasurementTime = 0;
         aidl_result.ntbMaxMeasurementTime = 0;
+        aidl_result.numTxSpatialStreams = 0;
+        aidl_result.numRxSpatialStreams = 0;
         aidl_results->push_back(aidl_result);
     }
     return true;
@@ -3019,6 +3021,8 @@ bool convertLegacyVectorOfRttResultV2ToAidl(
         aidl_result.r2iTxLtfRepetitionCount = 0;
         aidl_result.ntbMinMeasurementTime = 0;
         aidl_result.ntbMaxMeasurementTime = 0;
+        aidl_result.numTxSpatialStreams = 0;
+        aidl_result.numRxSpatialStreams = 0;
         aidl_results->push_back(aidl_result);
     }
     return true;
@@ -3044,6 +3048,8 @@ bool convertLegacyVectorOfRttResultV3ToAidl(
         aidl_result.r2iTxLtfRepetitionCount = legacy_result->r2i_tx_ltf_repetition_count;
         aidl_result.ntbMinMeasurementTime = legacy_result->ntb_min_measurement_time;
         aidl_result.ntbMaxMeasurementTime = legacy_result->ntb_max_measurement_time;
+        aidl_result.numTxSpatialStreams = legacy_result->num_tx_sts;
+        aidl_result.numRxSpatialStreams = legacy_result->num_rx_sts;
         aidl_results->push_back(aidl_result);
     }
     return true;