diff --git a/Building-mruby.md b/Building-mruby.md
index 6573eaf..511bbab 100644
--- a/Building-mruby.md
+++ b/Building-mruby.md
@@ -26,10 +26,14 @@ toolchain they're most productive with.
   dir, delete the generated `CMakeFiles/` directory and `CMakeCache.txt` file, `cd` to
   another dir (hint: the included `build` subdir), and run `cmake` again.
 
-### Native builds
+### Native builds from the command line
 
 _in process_, see this [introductory post](http://jonforums.github.com/ruby/2012/05/09/cmake-prototype-for-mruby.html) in the interm.
 
-### Cross compiled builds
+### Cross compiled builds from the command line
 
-_in process_, see this [basic cross compiling post](http://jonforums.github.com/ruby/2012/05/13/cross-compiling-mruby.html) in the interm.
\ No newline at end of file
+_in process_, see this [basic cross compiling post](http://jonforums.github.com/ruby/2012/05/13/cross-compiling-mruby.html) in the interm.
+
+### Native OS X builds from Xcode IDE
+
+_in process_, do not edit source that's been copied into the build directory (**TODO** elaborate!)
\ No newline at end of file