diff --git a/fern/test/test-suites.mdx b/fern/test/test-suites.mdx
index e5e0a9811..2787d214f 100644
--- a/fern/test/test-suites.mdx
+++ b/fern/test/test-suites.mdx
@@ -4,6 +4,10 @@ subtitle: End-to-end test automation for AI voice agents
 slug: /test/test-suites
 ---
 
+<Warning>
+Test Suites is being deprecated. It will be replaced by Simulations, a more powerful way to test your voice agents. You can keep using Test Suites in the meantime, and we'll share a migration guide once Simulations is ready.
+</Warning>
+
 ## Overview
 
 **Test Suite** is an end-to-end feature that automates testing of your AI voice agents. Our platform simulates an AI tester that interacts with your voice agent by following a pre-defined script. After the interaction, the transcript is sent to a language model (LLM) along with your evaluation rubric. The LLM then determines if the interaction met the defined objectives.