diff --git a/os/hal/hal.dox b/os/hal/hal.dox
index 5bee98480..6ed44eacc 100644
--- a/os/hal/hal.dox
+++ b/os/hal/hal.dox
@@ -51,14 +51,17 @@
  * @subsection hal_device_driver_diagram Diagram
  * @dot
   digraph example {
+    graph [size="5, 7", pad="1.5, 0"];
     node [shape=rectangle, fontname=Helvetica, fontsize=8,
           fixedsize="true", width="2.0", height="0.4"];
     edge [fontname=Helvetica, fontsize=8];
+
     app [label="Application"];
     hld [label="High Level Driver"];
     lld [label="Low Level Driver"];
     hw [label="Microcontroller Hardware"];
     hal_lld [label="HAL shared low level code"];
+
     app->hld;
     hld->lld;
     lld-> hw;