diff --git a/README.rdoc b/README.rdoc
index ec38d53..320c510 100644
--- a/README.rdoc
+++ b/README.rdoc
@@ -127,7 +127,7 @@ exposed by default. E.g.
 * download and build V8: http://code.google.com/apis/v8/build.html
 * Be sure to build it as a static library and with the same architecture as your ruby executable. e.g. 
 * scons library=static arch=x64
-* sudo gem install therubyracer --with-v8-include=/path/to/v8/source/include --with-v8-lib=/path/to/v8/source 
+* sudo gem install therubyracer -- --with-v8-include=/path/to/v8/source/include --with-v8-lib=/path/to/v8/source 
 
 == LICENSE: