diff --git a/README.md b/README.md
index 96802b2..40d6652 100644
--- a/README.md
+++ b/README.md
@@ -72,8 +72,8 @@ CloudWatch alarms publish to the shared `site-alerts` SNS topic (`arn:aws:sns:us
 | `front-user-sync-errors` | Lambda `Errors` (Sum) | Any invocation error in a 5-min window |
 | `front-user-sync-throttles` | Lambda `Throttles` (Sum) | Any throttled invocation in a 5-min window |
 | `front-user-sync-duration` | Lambda `Duration` (Max) | Run exceeds 270s (90% of the 300s timeout) |
-| `front-sla-alerts-throttled-requests` | DynamoDB `ThrottledRequests` (Sum) | Any throttled request on the table |
-| `front-sla-alerts-system-errors` | DynamoDB `SystemErrors` (Sum) | Any HTTP 500 from the table |
+| `front-sla-alerts-read-throttle` | DynamoDB `ReadThrottleEvents` (Sum) | Any read throttle on the table |
+| `front-sla-alerts-write-throttle` | DynamoDB `WriteThrottleEvents` (Sum) | Any write throttle on the table |
 
 ## Secrets (Secrets Manager)