diff --git a/docs/src/user-guide/command-line-interface.md b/docs/src/user-guide/command-line-interface.md
index c8ddefe0f21..0b48a0d64af 100644
--- a/docs/src/user-guide/command-line-interface.md
+++ b/docs/src/user-guide/command-line-interface.md
@@ -298,6 +298,8 @@ This option is helpful if you are using another program to format your code but
 
 #### `--ignore-path`
 
+**Note:** `--ignore-path` is not supported when using flat config (`eslint.config.js`).
+
 This option allows you to specify the file to use as your `.eslintignore`. By default, ESLint looks in the current working directory for `.eslintignore`. You can override this behavior by providing a path to a different file.
 
 Example: