diff --git a/binder/android/os/IVold.aidl b/binder/android/os/IVold.aidl
index 229f173..d121dee 100644
--- a/binder/android/os/IVold.aidl
+++ b/binder/android/os/IVold.aidl
@@ -66,6 +66,8 @@
     void fstrim(int fstrimFlags, IVoldTaskListener listener);
     void runIdleMaint(boolean needGC, IVoldTaskListener listener);
     void abortIdleMaint(IVoldTaskListener listener);
+    // Returns the amount of storage lifetime used, as a percentage.
+    // (eg, 10 indicates 10% of lifetime used), or -1 on failure.
     int getStorageLifeTime();
     void setGCUrgentPace(int neededSegments, int minSegmentThreshold,
                          float dirtyReclaimRate, float reclaimWeight,
@@ -135,6 +137,11 @@
 
     long getStorageSize();
 
+    // Returns the remaining storage lifetime as a percentage, rounded up as
+    // needed when the underlying hardware reports low precision. Returns -1
+    // on failure.
+    int getStorageRemainingLifetime();
+
     const int FSTRIM_FLAG_DEEP_TRIM = 1;
 
     const int MOUNT_FLAG_PRIMARY = 1;