diff --git a/core/java/android/os/Process.java b/core/java/android/os/Process.java
index 30749429c4cf8..93516619aab66 100644
--- a/core/java/android/os/Process.java
+++ b/core/java/android/os/Process.java
@@ -773,7 +773,8 @@ public class Process {
     /**
      * Return the current priority of a thread, based on Linux priorities.
      * 
-     * @param tid The identifier of the thread/process to change.
+     * @param tid The identifier of the thread/process. If tid equals zero, the priority of the
+     * calling process/thread will be returned.
      * 
      * @return Returns the current priority, as a Linux priority level,
      * from -20 for highest scheduling priority to 19 for lowest scheduling