2 files changed, 19 insertions, 1 deletions
diff --git a/clang/include/clang/Basic/Attr.td b/clang/include/clang/Basic/Attr.td
index 2855207b4b6..3376f640a12 100644
--- a/clang/include/clang/Basic/Attr.td
+++ b/clang/include/clang/Basic/Attr.td
@@ -1542,7 +1542,7 @@ def Target : InheritableAttr {
 def TransparentUnion : InheritableAttr {
   let Spellings = [GCC<"transparent_union">];
 //  let Subjects = SubjectList<[Record, TypedefName]>;
-  let Documentation = [Undocumented];
+  let Documentation = [TransparentUnionDocs];
   let LangOpts = [COnly];
 }
 
diff --git a/clang/include/clang/Basic/AttrDocs.td b/clang/include/clang/Basic/AttrDocs.td
index b62ac7cf2a2..44e0a8e400c 100644
--- a/clang/include/clang/Basic/AttrDocs.td
+++ b/clang/include/clang/Basic/AttrDocs.td
@@ -2649,3 +2649,21 @@ Conversely, ``__attribute__((xray_never_instrument))`` or ``[[clang::xray_never_
 If a function has neither of these attributes, they become subject to the XRay heuristics used to determine whether a function should be instrumented or otherwise.
   }];
 }
+
+def TransparentUnionDocs : Documentation {
+  let Category = DocCatType;
+  let Content = [{
+This attribute can be applied to a union to change the behaviour of calls to
+functions that have an argument with a transparent union type. The compiler
+behaviour is changed in the following manner:
+
+- A value whose type is any member of the transparent union can be passed as an
+argument without the need to cast that value.
+
+- The argument is passed to the function using the calling convention of the
+first member of the transparent union. Consequently, all the members of the
+transparent union should have the same calling convention as its first member.
+
+Transparent unions are not supported in C++.
+  }];
+}