diff --git a/Documentation/DocBook/v4l/io.xml b/Documentation/DocBook/v4l/io.xml
index e870330cbf77..bb685ed6fe7b 100644
--- a/Documentation/DocBook/v4l/io.xml
+++ b/Documentation/DocBook/v4l/io.xml
@@ -918,8 +918,8 @@ order.
When the driver provides or accepts images field by field
rather than interleaved, it is also important applications understand
-how the fields combine to frames. We distinguish between top and
-bottom fields, the spatial order: The first line
+how the fields combine to frames. We distinguish between top (aka odd) and
+bottom (aka even) fields, the spatial order: The first line
of the top field is the first line of an interlaced frame, the first
line of the bottom field is the second line of that frame.
@@ -972,12 +972,12 @@ between V4L2_FIELD_TOP and
V4L2_FIELD_TOP
2
- Images consist of the top field only.
+ Images consist of the top (aka odd) field only.
V4L2_FIELD_BOTTOM
3
- Images consist of the bottom field only.
+ Images consist of the bottom (aka even) field only.
Applications may wish to prevent a device from capturing interlaced
images because they will have "comb" or "feathering" artefacts around
moving objects.