diff --git a/clang/docs/LanguageExtensions.rst b/clang/docs/LanguageExtensions.rst
index 7b23e4d1c2f30c..96691b45d63a37 100644
--- a/clang/docs/LanguageExtensions.rst
+++ b/clang/docs/LanguageExtensions.rst
@@ -1610,6 +1610,7 @@ The following type trait primitives are supported by Clang. Those traits marked
 * ``__is_pod`` (C++, GNU, Microsoft, Embarcadero):
   Note, the corresponding standard trait was deprecated in C++20.
 * ``__is_pointer`` (C++, Embarcadero)
+* ``__is_pointer_interconvertible_base_of`` (C++, GNU, Microsoft)
 * ``__is_polymorphic`` (C++, GNU, Microsoft, Embarcadero)
 * ``__is_reference`` (C++, Embarcadero)
 * ``__is_referenceable`` (C++, GNU, Microsoft, Embarcadero):