diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt
index dd083b2..68bbc25 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -1978,12 +1978,20 @@
 
     vid             - Vendor ID for the device (optional)
     pid             - Product ID for the device (optional)
+    nrpacks	    - Max. number of packets per URB (default: 8)
+    async_unlink    - Use async unlink mode (default: yes)
     device_setup    - Device specific magic number (optional)
                     - Influence depends on the device
                     - Default: 0x0000 
 
     This module supports multiple devices, autoprobe and hotplugging.
 
+    NB: nrpacks parameter can be modified dynamically via sysfs.
+        Don't put the value over 20.  Changing via sysfs has no sanity
+	check.
+    NB: async_unlink=0 would cause Oops.  It remains just for
+        debugging purpose (if any).
+
   Module snd-usb-caiaq
   --------------------