Update index.md - added information about real-time computations

Author: Olesia

src/engage/audiences/index.md

@@ -141,6 +141,9 @@ Real-time Compute allows you to update traits and Audiences as Segment receives
 - **Instant Messaging:** Trigger messages in email, live chat, and push notifications instantly, to deliver immediate experiences across channels.
 - **Operational Workflows:** Supercharge your sales and support teams by responding to customer needs faster, based on the latest understanding of a user.
 
+> warning ""
+> Real-time Compute doesn't support time window conditions. Audiences using time window conditions will be created as batch computations. Additionally, [Funnel Audiences](#funnel-audiences) will be created as batch computations.
+
 To create a new Audience or Trait:
 
 1. Go to your **Computed Traits** or **Audiences** tab in Engage and select **Create**.