diff --git a/graphics/composer/aidl/aidl_api/android.hardware.graphics.composer3/current/android/hardware/graphics/composer3/RefreshRateChangedDebugData.aidl b/graphics/composer/aidl/aidl_api/android.hardware.graphics.composer3/current/android/hardware/graphics/composer3/RefreshRateChangedDebugData.aidl
index 2b9801a..e9305e1 100644
--- a/graphics/composer/aidl/aidl_api/android.hardware.graphics.composer3/current/android/hardware/graphics/composer3/RefreshRateChangedDebugData.aidl
+++ b/graphics/composer/aidl/aidl_api/android.hardware.graphics.composer3/current/android/hardware/graphics/composer3/RefreshRateChangedDebugData.aidl
@@ -36,4 +36,5 @@
 parcelable RefreshRateChangedDebugData {
   long display;
   int vsyncPeriodNanos;
+  int refreshPeriodNanos;
 }
diff --git a/graphics/composer/aidl/android/hardware/graphics/composer3/RefreshRateChangedDebugData.aidl b/graphics/composer/aidl/android/hardware/graphics/composer3/RefreshRateChangedDebugData.aidl
index c1f78d6..11c0112 100644
--- a/graphics/composer/aidl/android/hardware/graphics/composer3/RefreshRateChangedDebugData.aidl
+++ b/graphics/composer/aidl/android/hardware/graphics/composer3/RefreshRateChangedDebugData.aidl
@@ -27,4 +27,15 @@
      * The display vsync period in nanoseconds.
      */
     int vsyncPeriodNanos;
+
+    /**
+     * The refresh period of the display in nanoseconds.
+     * On VRR (Variable Refresh Rate) displays, refreshPeriodNanos can be different from the
+     * vsyncPeriodNanos because not every vsync cycle of the display is a refresh cycle.
+     * This should be set to the current refresh period.
+     * On non-VRR displays this value should be equal to vsyncPeriodNanos
+     *
+     * @see vsyncPeriodNanos
+     */
+    int refreshPeriodNanos;
 }