diff --git a/Documentation/DocBook/media/v4l/dev-raw-vbi.xml b/Documentation/DocBook/media/v4l/dev-raw-vbi.xml
index b788c72c885e04f16109ea17b2026061fdeb0e9f..f4b61b6ce3c25cc5bc415295f728e58beba2c247 100644
--- a/Documentation/DocBook/media/v4l/dev-raw-vbi.xml
+++ b/Documentation/DocBook/media/v4l/dev-raw-vbi.xml
@@ -150,9 +150,15 @@ signal. Drivers shall not convert the sample format by software.
This is the scanning system line number
associated with the first line of the VBI image, of the first and the
second field respectively. See and
- for valid values. VBI input drivers can
-return start values 0 if the hardware cannot reliable identify
-scanning lines, VBI acquisition may not require this
+ for valid values.
+The V4L2_VBI_ITU_525_F1_START,
+V4L2_VBI_ITU_525_F2_START,
+V4L2_VBI_ITU_625_F1_START and
+V4L2_VBI_ITU_625_F2_START defines give the start line
+numbers for each field for each 525 or 625 line format as a convenience.
+Don't forget that ITU line numbering starts at 1, not 0.
+VBI input drivers can return start values 0 if the hardware cannot
+reliable identify scanning lines, VBI acquisition may not require this
information.
diff --git a/Documentation/DocBook/media/v4l/dev-sliced-vbi.xml b/Documentation/DocBook/media/v4l/dev-sliced-vbi.xml
index 548f8ea28dee97862c1c07a4e39947d7ee790160..7a8bf3011ee999861b3c338f1b47316052f99a85 100644
--- a/Documentation/DocBook/media/v4l/dev-sliced-vbi.xml
+++ b/Documentation/DocBook/media/v4l/dev-sliced-vbi.xml
@@ -185,7 +185,14 @@ tables, sigh. -->
Drivers must set
service_lines[0][0] and
-service_lines[1][0] to zero.
+service_lines[1][0] to zero.
+The V4L2_VBI_ITU_525_F1_START,
+V4L2_VBI_ITU_525_F2_START,
+V4L2_VBI_ITU_625_F1_START and
+V4L2_VBI_ITU_625_F2_START defines give the start
+line numbers for each field for each 525 or 625 line format as a
+convenience. Don't forget that ITU line numbering starts at 1, not 0.
+
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