diff --git a/Rakefile b/Rakefile
index 273cb5849..36124502b 100644
--- a/Rakefile
+++ b/Rakefile
@@ -12,7 +12,8 @@ require 'rake/gempackagetask'
 begin
   require 'spec/rake/spectask'
 rescue LoadError
-  STDERR.puts 'Please install RSpec.'
+  STDERR.puts "Please install rspec:"
+  STDERR.puts "sudo gem install rspec"
   exit(1)
 end