diff --git a/docs/content/configuration/config-file/layout.md b/docs/content/configuration/config-file/layout.md
index 3f782c7d..9c9befa9 100644
--- a/docs/content/configuration/config-file/layout.md
+++ b/docs/content/configuration/config-file/layout.md
@@ -48,6 +48,7 @@ The following `type` values are supported:
 | `"temp", "temperature"`             | Temperature table        |
 | `"temp_graph", "temperature_graph"` | Temperature graph        |
 | `"disk"`                            | Disk table               |
+| `"disk_io_graph"`                   | Disk I/O graph           |
 | `"empty"`                           | An empty space           |
 | `"batt", "battery"`                 | Battery statistics       |