diff --git a/llvm/docs/ReleaseNotes.rst b/llvm/docs/ReleaseNotes.rst
index ecfcd2c983ce5..ff929b0bc5e15 100644
--- a/llvm/docs/ReleaseNotes.rst
+++ b/llvm/docs/ReleaseNotes.rst
@@ -435,6 +435,13 @@ Changes to Sanitizers
 ---------------------
 * HWASan now defaults to detecting use-after-scope bugs.
 
+* `SpecialCaseList <https://clang.llvm.org/docs/SanitizerSpecialCaseList.html#format>`_
+  used by sanitizer ignore lists (e.g. ``*_ignorelist.txt`` in the Clang
+  resource directory) now uses glob patterns instead of a variant of POSIX
+  Extended Regular Expression (where ``*`` is translated to ``.*``) by default.
+  Search for ``|`` to find patterns that may have different meanings now, and
+  replace ``a|b`` with ``{a,b}``.
+
 Changes to the Profile Runtime
 ------------------------------