# Injection security definitions You can inject Security Definitions widget into any place of your specification `description`: ```markdown ... # Authorization Some description ... ``` Inject instruction is wrapped into HTML comment so it is **visible only in ReDoc**. It won't be visible e.g. in SwaggerUI. # Default behavior If injection tag is not found in the description it will be appended to the end of description under `Authentication` header. If `Authentication` header is already present in the description, Security Definitions won't be inserted and rendered at all.