diff --git a/telecomm/java/android/telecom/CallAttributes.java b/telecomm/java/android/telecom/CallAttributes.java
index 1a0f192..f3ef834 100644
--- a/telecomm/java/android/telecom/CallAttributes.java
+++ b/telecomm/java/android/telecom/CallAttributes.java
@@ -58,6 +58,9 @@
     /** @hide **/
     public static final String CALL_CAPABILITIES_KEY = "TelecomCapabilities";
 
+    /** @hide **/
+    public static final String CALLER_PID = "CallerPid";
+
     private CallAttributes(@NonNull PhoneAccountHandle phoneAccountHandle,
             @NonNull CharSequence displayName,
             @NonNull Uri address,