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-rw-r--r--llvm/docs/LangRef.rst5
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diff --git a/llvm/docs/LangRef.rst b/llvm/docs/LangRef.rst
index 62fdda91218..8bef503abf9 100644
--- a/llvm/docs/LangRef.rst
+++ b/llvm/docs/LangRef.rst
@@ -1708,6 +1708,11 @@ example:
entity to fine grain the HW control flow protection mechanism. The flag
is target independant and currently appertains to a function or function
pointer.
+``shadowcallstack``
+ This attribute indicates that the ShadowCallStack checks are enabled for
+ the function. The instrumentation checks that the return address for the
+ function has not changed between the function prolog and eiplog. It is
+ currently x86_64-specific.
.. _glattrs:
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