diff --git a/core/java/android/os/Debug.java b/core/java/android/os/Debug.java
index bc32df42ea4f7..563492925ff0b 100644
--- a/core/java/android/os/Debug.java
+++ b/core/java/android/os/Debug.java
@@ -1754,6 +1754,8 @@ public final class Debug
      * such runtime statistic exists.
      *
      * <p>The following table lists the runtime statistics that the runtime supports.
+     * All statistics are approximate. Individual allocations may not be immediately reflected
+     * in the results.
      * Note runtime statistics may be added or removed in a future API level.</p>
      *
      * <table>