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-rw-r--r--doc/user/io.t7
1 files changed, 7 insertions, 0 deletions
diff --git a/doc/user/io.t b/doc/user/io.t
index 9ab2be053e..a405994ec2 100644
--- a/doc/user/io.t
+++ b/doc/user/io.t
@@ -70,6 +70,13 @@ The exact usage of the minor number is driver specific, but is
commonly used to distinguish between a number of devices
controlled by the same driver.
+@findex rtems_device_major_number
+@findex rtems_device_minor_number
+
+The data types @code{@value{DIRPREFIX}device_major_number} and
+@code{@value{DIRPREFIX}device_minor_number} are used to
+manipulate device major and minor numbers, respectively.
+
@subsection Device Names
@cindex device names