diff --git a/clang/docs/AddressSanitizer.rst b/clang/docs/AddressSanitizer.rst
--- a/clang/docs/AddressSanitizer.rst
+++ b/clang/docs/AddressSanitizer.rst
@@ -14,8 +14,9 @@
 
 * Out-of-bounds accesses to heap, stack and globals
 * Use-after-free
-* Use-after-return (runtime flag `ASAN_OPTIONS=detect_stack_use_after_return=1`)
-* Use-after-scope (clang flag `-fsanitize-address-use-after-scope`)
+* Use-after-return (clang flag ``-fsanitize-address-use-after-return=(always|runtime|never)`` default: ``runtime``)
+    * Enable ``runtime`` with: ``ASAN_OPTIONS=detect_stack_use_after_return=1``
+* Use-after-scope (clang flag ``-fsanitize-address-use-after-scope``)
 * Double-free, invalid free
 * Memory leaks (experimental)
 
diff --git a/clang/docs/ClangCommandLineReference.rst b/clang/docs/ClangCommandLineReference.rst
--- a/clang/docs/ClangCommandLineReference.rst
+++ b/clang/docs/ClangCommandLineReference.rst
@@ -881,6 +881,15 @@
 * ``global`` - Emit module destructors that are called via a platform specific array (see `llvm.global_dtors`).
 * ``none`` - Do not emit module destructors.
 
+.. option:: -fsanitize-address-use-after-return=<arg>
+
+Select the enabling method of detecting stack use-after-return in AddressSanitizer.
+
+Valid options are:
+* ``always`` - Detect use-after-return.
+* ``runtime`` - Detect use-after-return with runtime ON/OFF switch (environment variable `ASAN_OPTIONS=detect_stack_use_after_return=1`, default: 0)
+* ``never`` - Do not detect use-after-return.
+
 .. option:: -fsanitize-ignorelist=<arg>
 
 Path to ignorelist file for sanitizers