Index: docs/TestingGuide.rst
===================================================================
--- docs/TestingGuide.rst
+++ docs/TestingGuide.rst
@@ -387,6 +387,46 @@
 triple, test with the specific FileCheck and put it into the specific
 directory that will filter out all other architectures.
 
+REQUIRES and REQUIRES-ANY directive
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Some tests can be enabled only in specific situation - like having
+debug build. Use ``REQUIRES`` directive to specify those requirements.
+
+.. code-block:: llvm
+
+    ; This test will be only enabled in the build with asserts
+    ; REQUIRES asserts
+
+You can separate requirements by a coma.
+If test depends on one of many requirements, use ``REQUIRES-ANY``.
+
+List of features that can be used in ``REQUIRES`` and ``REQUIRES-ANY``:
+- asserts
+- shell
+- can-execute
+- loadable_module
+- asan
+- not_asan
+- msan
+- not_msan
+- ubsan
+- not_ubsan
+- long_tests
+- object-emission
+- zlib
+- nozlib
+- default_triple
+- x86_64-linux
+- native
+- ld_emu_elf32ppc
+- ld_plugin
+- ld64_plugin
+- fma3
+- system-windows
+- debug_frame
+- global-isel
+- xar
 
 Substitutions
 -------------