diff --git a/attractor-spec.md b/attractor-spec.md
index 0846d86..8603c59 100644
--- a/attractor-spec.md
+++ b/attractor-spec.md
@@ -1620,7 +1620,7 @@ The engine emits typed events during execution for UI, logging, and metrics inte
 - `StageStarted(name, index)` -- stage begins
 - `StageCompleted(name, index, duration)` -- stage succeeded
 - `StageFailed(name, index, error, will_retry)` -- stage failed
-- `StageRetrying(name, index, attempt, delay)` -- stage retrying
+- `StageRetrying(name, index, attempt, delay, error)` -- stage retrying
 
 **Parallel execution events:**
 - `ParallelStarted(branch_count)` -- parallel block started