diff --git a/README.md b/README.md
index 734aae26..e748d900 100644
--- a/README.md
+++ b/README.md
@@ -13,10 +13,6 @@
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## changed-files
Effortlessly track all changed files and directories relative to a target branch, preceding commit or the last remote commit returning **relative paths** from the project root using this GitHub action.
@@ -300,6 +296,9 @@ Support this project with a :star:
| U | Unmerged |
| X | Unknown |
+> **Warning**:
+> * When using `files_yaml*` ensure all ouputs are prefixed by the key. e.g. `test_added_files`, `test_any_changed`
+
## Outputs