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-rw-r--r--eng/req/items.rst4
1 files changed, 4 insertions, 0 deletions
diff --git a/eng/req/items.rst b/eng/req/items.rst
index e1b0aa3..cba6cc6 100644
--- a/eng/req/items.rst
+++ b/eng/req/items.rst
@@ -1563,6 +1563,10 @@ name
The attribute value shall be a string. It shall be the name of the
unspecified interface.
+reference
+ The attribute value shall be an optional string. If the value is present,
+ then it shall be an URL to the standard or specification of the interface.
+
.. _SpecTypeInterfaceVariableItemType:
Interface Variable Item Type