diff --git a/content/en/llm_observability/instrumentation/api.md b/content/en/llm_observability/instrumentation/api.md
index a4033d905869e..6b99980b9c498 100644
--- a/content/en/llm_observability/instrumentation/api.md
+++ b/content/en/llm_observability/instrumentation/api.md
@@ -10,6 +10,8 @@ aliases:
 
 The LLM Observability API provides an interface for developers to send LLM-related traces and spans to Datadog. If your application is written in Python or Node.js, you can use the [LLM Observability SDKs][1].
 
+The API accepts spans with timestamps no more than 24 hours old, allowing limited backfill of delayed data.
+
 ## Spans API
 
 Use this endpoint to send spans to Datadog. For details on the available kinds of spans, see [Span Kinds][2].