diff --git a/README.rdoc b/README.rdoc
index 094577e..8256b92 100644
--- a/README.rdoc
+++ b/README.rdoc
@@ -38,6 +38,12 @@ Then inside the ruby-opencv folder run:
 
   rake install_gem
 
+Or
+
+  ruby extconf.rb
+  make
+  make install
+
 You can also add ruby-opencv in your Gemfile:
 
   echo -e "\n"'gem "opencv", :git => "https://github.com/ser1zw/ruby-opencv"' >> Gemfile