diff --git a/README.md b/README.md
index 7ada0b4e..473b5cc2 100644
--- a/README.md
+++ b/README.md
@@ -47,7 +47,7 @@ Retrieve all changed files and directories relative to the target branch or the
 > *   For monorepos where pulling all the branch history might not be desired, you can omit `fetch-depth` for `pull_request` events.
 > *   For files located in a sub-directory ensure that the pattern specified contains `**/` (globstar) to match any preceding directories or explicitly pass the full path relative to the project root. See: [#314](https://github.com/tj-actions/changed-files/issues/314).
 > *   All multiline inputs should not use double or single qoutes since the value is already a string seperated by a newline character. See [Examples](#examples) for more information.
-> *   Ensure that `persist-credentials` is set to `true` when configuring `actions/checkout`.
+> *   Ensure that `persist-credentials` is set to `true` when configuring `actions/checkout` if `fetch-depth` isn't set to `0`.
 
 ```yaml
 name: CI