doc: shard not supported with watch mode

pulkit-30 · UlisesGascon · commit e14f661950b6 · 2023-12-19T16:17:51.000Z
PR-URL: #50640 Reviewed-By: Raz Luvaton <rluvaton@gmail.com> Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
diff --git a/doc/api/test.md b/doc/api/test.md
@@ -1161,6 +1161,11 @@ changes:
       of shards to split the test files to. This option is _required_.
 * Returns: {TestsStream}
 
+**Note:** `shard` is used to horizontally parallelize test running across
+machines or processes, ideal for large-scale executions across varied
+environments. It's incompatible with `watch` mode, tailored for rapid
+code iteration by automatically rerunning tests on file changes.
+
 ```mjs
 import { tap } from 'node:test/reporters';
 import { run } from 'node:test';
