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-rw-r--r--Documentation/sound/alsa-configuration.rst9
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diff --git a/Documentation/sound/alsa-configuration.rst b/Documentation/sound/alsa-configuration.rst
index 65f61695f561..34888d4fc4a8 100644
--- a/Documentation/sound/alsa-configuration.rst
+++ b/Documentation/sound/alsa-configuration.rst
@@ -100,6 +100,15 @@ amidi_map
MIDI device number maps assigned to the 2st OSS device;
Default: 1
+Module snd-soc-core
+-------------------
+
+The soc core module. It is used by all ALSA card drivers.
+It takes the following options which have global effects.
+
+prealloc_buffer_size_kbytes
+ Specify prealloc buffer size in kbytes (default: 512).
+
Common parameters for top sound card modules
--------------------------------------------