diff --git a/include/linux/firewire-cdev.h b/include/linux/firewire-cdev.h
index c6b3ca3..1f716d9 100644
--- a/include/linux/firewire-cdev.h
+++ b/include/linux/firewire-cdev.h
@@ -340,6 +340,9 @@
  * The @closure field is passed back to userspace in the response event.
  * The @handle field is an out parameter, returning a handle to the allocated
  * range to be used for later deallocation of the range.
+ *
+ * The address range is allocated on all local nodes.  The address allocation
+ * is exclusive except for the FCP command and response registers.
  */
 struct fw_cdev_allocate {
 	__u64 offset;