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diff --git a/doc/bsp_howto/clock.t b/doc/bsp_howto/clock.t
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--- a/doc/bsp_howto/clock.t
+++ b/doc/bsp_howto/clock.t
@@ -19,6 +19,9 @@ The clock driver is located in the @code{clock} directory of the BSP.
@section Clock Driver Global Variables
+This section describes the global variables expected to be provided by
+this driver.
+
@subsection Major and Minor Number
The major and minor numbers of the clock driver are made available via