diff --git a/docs/index.md b/docs/index.md
index 492bf21351..415430a3d4 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -810,6 +810,7 @@ Again, use `this.timeout(0)` to disable the timeout for a hook.
 
 > In v3.0.0 or newer, a parameter passed to `this.timeout()` greater than the [maximum delay value][mdn-settimeout-maxdelay] will cause the timeout to be disabled.
 > In v8.0.0 or newer, `this.enableTimeouts()` has been removed.
+> **Warning:** With async tests if you disable timeouts via `this.timeout(0)` and then do not call `done()`, your test will exit silently.
 
 ## Diffs