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
diff --git a/Documentation/userspace-api/media/mediactl/media-types.rst b/Documentation/userspace-api/media/mediactl/media-types.rst
index 0a26397bd01d..0ffeece1e0c8 100644
--- a/Documentation/userspace-api/media/mediactl/media-types.rst
+++ b/Documentation/userspace-api/media/mediactl/media-types.rst
@@ -412,14 +412,21 @@ must be set for every pad.
 	  is set by drivers and is read-only for applications.
 
     *  -  ``MEDIA_LNK_FL_LINK_TYPE``
-       -  This is a bitmask that defines the type of the link. Currently,
-	  two types of links are supported:
+       -  This is a bitmask that defines the type of the link. The following
+	  link types are currently supported:
 
 	  .. _MEDIA-LNK-FL-DATA-LINK:
 
-	  ``MEDIA_LNK_FL_DATA_LINK`` if the link is between two pads
+	  ``MEDIA_LNK_FL_DATA_LINK`` for links that represent a data connection
+	  between two pads.
 
 	  .. _MEDIA-LNK-FL-INTERFACE-LINK:
 
-	  ``MEDIA_LNK_FL_INTERFACE_LINK`` if the link is between an
-	  interface and an entity
+	  ``MEDIA_LNK_FL_INTERFACE_LINK`` for links that associate an entity to its
+	  interface.
+
+	  .. _MEDIA-LNK-FL-ANCILLARY-LINK:
+
+	  ``MEDIA_LNK_FL_ANCILLARY_LINK`` for links that represent a physical
+	  relationship between two entities. The link may or may not be
+	  immutable, so applications must not assume either case.
diff --git a/include/uapi/linux/media.h b/include/uapi/linux/media.h
index 200fa8462b90..afbae7213d35 100644
--- a/include/uapi/linux/media.h
+++ b/include/uapi/linux/media.h
@@ -226,6 +226,7 @@ struct media_pad_desc {
 #define MEDIA_LNK_FL_LINK_TYPE			(0xf << 28)
 #  define MEDIA_LNK_FL_DATA_LINK		(0 << 28)
 #  define MEDIA_LNK_FL_INTERFACE_LINK		(1 << 28)
+#  define MEDIA_LNK_FL_ANCILLARY_LINK		(2 << 28)
 
 struct media_link_desc {
 	struct media_pad_desc source;