diff --git a/hw/core/machine.c b/hw/core/machine.c
index 06e0c9a179..27372bb01e 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -1204,6 +1204,8 @@ static void machine_class_init(ObjectClass *oc, const void *data)
     object_class_property_add_bool(oc, "aux-ram-share",
                                    machine_get_aux_ram_share,
                                    machine_set_aux_ram_share);
+    object_class_property_set_description(oc, "aux-ram-share",
+        "Use anonymous shared memory for auxiliary guest RAMs");
 #endif
 
     object_class_property_add_bool(oc, "usb",