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diff --git a/Documentation/userspace-api/media/glossary.rst b/Documentation/userspace-api/media/glossary.rst
index 96a360edbf3b..55a9c37130ba 100644
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+++ b/Documentation/userspace-api/media/glossary.rst
@@ -25,6 +25,13 @@ Glossary
See :ref:`cec`.
+ Data Unit
+
+ Unit of data transported by a bus. On parallel buses, the data unit
+ consists of one or more related samples while on serial buses the data
+ unit is logical. If the data unit is image data, it may also be called a
+ pixel.
+
Device Driver
Part of the Linux Kernel that implements support for a hardware
component.
@@ -173,6 +180,11 @@ Glossary
An integrated circuit that integrates all components of a computer
or other electronic systems.
+ Stream
+ A distinct flow of data (image data or metadata) from an initial source
+ to a final sink. The initial source may be e.g. an image sensor and the
+ final sink e.g. a memory buffer.
+
V4L2 API
**V4L2 userspace API**