diff --git a/README.rdoc b/README.rdoc
index b73e41dc..6bc8a091 100644
--- a/README.rdoc
+++ b/README.rdoc
@@ -162,8 +162,12 @@ $ ruby g:/192/lib/ruby/gems/1.9.1/gems/ruby-prof-0.10.2/bin/ruby-prof ./some_fil
 
 Starting with the 0.6.1 release, ruby-prof supports profiling tests cases
 written using Ruby's built-in unit test framework (ie, test derived from
-Test::Unit::TestCase).  To enable profiling simply add the following line
-of code to within your test class:
+Test::Unit::TestCase).  To enable profiling add the following line somewhere
+in your test files:
+
+        require "ruby-prof/test"
+
+add the following line of code to within your test class:
 
         include RubyProf::Test