diff --git a/clang/docs/LanguageExtensions.rst b/clang/docs/LanguageExtensions.rst
--- a/clang/docs/LanguageExtensions.rst
+++ b/clang/docs/LanguageExtensions.rst
@@ -635,6 +635,7 @@
  T __builtin_elementwise_sin(T x)            return the sine of x interpreted as an angle in radians          floating point types
  T __builtin_elementwise_cos(T x)            return the cosine of x interpreted as an angle in radians        floating point types
  T __builtin_elementwise_floor(T x)          return the largest integral value less than or equal to x        floating point types
+ T __builtin_elementwise_log(T x)            return the natural logarithm of x                                floating point types
  T __builtin_elementwise_roundeven(T x)      round x to the nearest integer value in floating point format,   floating point types
                                              rounding halfway cases to even (that is, to the nearest value
                                              that is an even integer), regardless of the current rounding
diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -845,6 +845,7 @@
   unsafe floating-point optimizations use ``-funsafe-math-optimizations`` or
   ``-ffast-math`` instead.
 - Add ``__builtin_elementwise_sin`` and ``__builtin_elementwise_cos`` builtins for floating point types only.
+- Add ``__builtin_elementwise_log``builtin for floating point types only.
 
 Internal API Changes
 --------------------