diff --git a/Layouts.md b/Layouts.md
index 31b8422..cba4055 100644
--- a/Layouts.md
+++ b/Layouts.md
@@ -443,6 +443,8 @@ Here are the different classes:
    ```
    </details>
 
+* If you want to add a key that does nothing (may be useful in a popup for example), you must write: `{ "label": " |!code/-1" },`
+
 # Examples of JSON files
 
 [Here](https://github.com/Helium314/HeliBoard/discussions/1132#discussion-7260853) are some sample JSON files that customize all the keyboard views.
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