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diff --git a/Documentation/ioctl/ioctl-decoding.txt b/Documentation/ioctl/ioctl-decoding.txt
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+To decode a hex IOCTL code:
+
+Most architecures use this generic format, but check
+include/ARCH/ioctl.h for specifics, e.g. powerpc
+uses 3 bits to encode read/write and 13 bits for size.
+
+ bits    meaning
+ 31-30  00 - no parameters: uses _IO macro
+        10 - read: _IOR
+        01 - write: _IOW
+        11 - read/write: _IOWR
+
+ 29-16  size of arguments
+
+ 15-8   ascii character supposedly
+        unique to each driver
+
+ 7-0    function #
+
+
+ So for example 0x82187201 is a read with arg length of 0x218,
+character 'r' function 1. Grepping the source reveals this is:
+
+#define VFAT_IOCTL_READDIR_BOTH         _IOR('r', 1, struct dirent [2])