added comment about error behavior with DEBUG=True

Author: grimborg

docs/api-guide/renderers.md

@@ -272,6 +272,8 @@ Exceptions raised and handled by an HTML renderer will attempt to render using o
 * Load and render a template named `api_exception.html`.
 * Render the HTTP status code and text, for example "404 Not Found".
 
+**Note**: If `DEBUG=True`, Django's standard traceback error page will be displayed instead of rendering the HTTP status code and text.
+
 Templates will render with a `RequestContext` which includes the `status_code` and `details` keys.
 
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