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-rw-r--r--Documentation/userspace-api/media/mediactl/media-controller-model.rst6
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/userspace-api/media/mediactl/media-controller-model.rst b/Documentation/userspace-api/media/mediactl/media-controller-model.rst
index 222cb99debb5..78bfdfb2a322 100644
--- a/Documentation/userspace-api/media/mediactl/media-controller-model.rst
+++ b/Documentation/userspace-api/media/mediactl/media-controller-model.rst
@@ -33,3 +33,9 @@ are:
- An **interface link** is a point-to-point bidirectional control
connection between a Linux Kernel interface and an entity.
+
+- An **ancillary link** is a point-to-point connection denoting that two
+ entities form a single logical unit. For example this could represent the
+ fact that a particular camera sensor and lens controller form a single
+ physical module, meaning this lens controller drives the lens for this
+ camera sensor. \ No newline at end of file