Index: clang/docs/ClangFormatStyleOptions.rst
===================================================================
--- clang/docs/ClangFormatStyleOptions.rst
+++ clang/docs/ClangFormatStyleOptions.rst
@@ -88,6 +88,11 @@
 
   -style='{key1: value1, key2: value2, ...}'
 
+`Whatstyle <https://github.com/mikr/whatstyle>`_ and `Unformat
+<https://github.com/johnmcfarlane/unformat>`_ can generate a .clang-format file
+from an existing codebase. Note that both of those tools are not officially
+supported and work on a best-effort basis.
+
 
 Disabling Formatting on a Piece of Code
 =======================================