diff --git a/Documentation/devicetree/bindings/mmc/mmc-controller.yaml b/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
index b96da0c7f819..f928f66fc59a 100644
--- a/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
+++ b/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
@@ -14,6 +14,10 @@ description: |
   that requires the respective functionality should implement them using
   these definitions.
 
+  It is possible to assign a fixed index mmcN to an MMC host controller
+  (and the corresponding mmcblkN devices) by defining an alias in the
+  /aliases device tree node.
+
 properties:
   $nodename:
     pattern: "^mmc(@.*)?$"