Add description for perm option of file plugin

Added the description for the new "perm" option of file plugin.

diff --git a/doc/asoundrc.txt b/doc/asoundrc.txt
index 0a485da..7a98f84 100644 (file)
--- a/doc/asoundrc.txt
+++ b/doc/asoundrc.txt
@@ -229,7 +229,7 @@ pcm.NAME {
   # or
   file INT             # File descriptor
   [format STR]         # File format (NYI)
-
+  [perm INT]           # File permission (default 0600)
 
   type meter           # Meter PCM
   slave STR            # Slave name (see pcm_slave)