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diff --git a/libcxx/docs/ReleaseNotes.rst b/libcxx/docs/ReleaseNotes.rst
index b7ad2e2a82c..20be9f627ef 100644
--- a/libcxx/docs/ReleaseNotes.rst
+++ b/libcxx/docs/ReleaseNotes.rst
@@ -52,3 +52,11 @@ API Changes
std::dynarray was a feature proposed for C++14 that was pulled from the
Standard at the last minute and was never standardized. Since there are no
plans to standardize this facility it is being removed.
+- Starting with LLVM 8.0.0, std::bad_array_length has been removed from the
+ library. std::bad_array_length was a feature proposed for C++14 alongside
+ std::dynarray, but it never actually made it into the C++ Standard. There
+ are no plans to standardize this feature at this time. Formally speaking,
+ this removal constitutes an ABI break because the symbols were shipped in
+ the shared library. However, on macOS systems, the feature was not usable
+ because it was hidden behind availability annotations. We do not expect
+ any actual breakage to happen from this change.
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