diff --git a/README.md b/README.md
index c5894005..da32e85a 100644
--- a/README.md
+++ b/README.md
@@ -320,7 +320,8 @@ Support this project with a :star:
 >
 > *   When using `files_yaml*` inputs:
 >     *   All keys must start with a letter or `_` and contain only alphanumeric characters, `-`, or `_`.
->         For example, `test` or `test_key` or `tesT-key` are all valid.
+>
+>         For example, `test` or `test_key` or `test-key` or `_test_key` are all valid.
 
 ## Inputs ⚙️