diff --git a/src/content/docs/speed/optimization/content/speed-brain.mdx b/src/content/docs/speed/optimization/content/speed-brain.mdx
index 623b4de0fe4d46..f43515d163970f 100644
--- a/src/content/docs/speed/optimization/content/speed-brain.mdx
+++ b/src/content/docs/speed/optimization/content/speed-brain.mdx
@@ -55,7 +55,7 @@ The configuration looks like this:
 }
 ```
 
-This configuration instructs the browser to initiate prefetch requests for future navigations. These prefetch requests will include the `sec-purpose: prefetch` HTTP request header. Prefetches that are not successful will respond with a `503` status code. Prefetches that are successful will respond with a `200` status code.
+This configuration instructs the browser to initiate prefetch requests for future navigations. These prefetch requests will include the `sec-purpose: prefetch` HTTP request header. Prefetches that are not successful will respond with a `406` status code (used to be `503`). Prefetches that are successful will respond with a `200` status code.
 
 ## Test Speed Brain