On Windows platforms, users must agree on addional license.

README.md

@@ -23,3 +23,16 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
 DEALINGS IN THE SOFTWARE.
 
+
+- On Windows platforms, you must agree on addional license too:
+
+Copyright Kevlin Henney, 1997, 2003, 2012. All rights reserved.
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose is hereby granted without fee, provided
+that this copyright and permissions notice appear in all copies and
+derivatives.
+
+This software is supplied "as is" without express or implied warranty.
+
+But that said, if there are any problems please get in touch.

mrbgem.rake

@@ -1,11 +1,13 @@
 MRuby::Gem::Specification.new('mruby-dir') do |spec|
   spec.license = 'MIT'
-  spec.authors = 'Internet Initiative Japan Inc.'
+  spec.authors = [ 'Internet Initiative Japan Inc.' ]
 
   spec.cc.include_paths << "#{build.root}/src"
   
   case RUBY_PLATFORM
   when /mingw|mswin/
+    spec.license = 'MIT and MIT-like license'
+    spec.authors += [ 'Kevlin Henney' ]
     spec.objs += Dir.glob("#{dir}/src/Win/*.{c,cpp,m,asm,S}").map { |f| 
       objfile(f.relative_path_from(dir).pathmap("#{build_dir}/%X")) 
     }