diff --git a/temporal/api/enums/v1/failed_cause.proto b/temporal/api/enums/v1/failed_cause.proto
index a2fbe5f6..a13684c7 100644
--- a/temporal/api/enums/v1/failed_cause.proto
+++ b/temporal/api/enums/v1/failed_cause.proto
@@ -124,4 +124,6 @@ enum ResourceExhaustedCause {
     RESOURCE_EXHAUSTED_CAUSE_PERSISTENCE_LIMIT = 4;
     // Workflow is busy
     RESOURCE_EXHAUSTED_CAUSE_BUSY_WORKFLOW = 5;
+    // Caller exceeds action per second limit.
+    RESOURCE_EXHAUSTED_CAUSE_APS_LIMIT = 6;
 }