diff --git a/Hacking.md b/Hacking.md
index ce2ceb30..e15f27aa 100644
--- a/Hacking.md
+++ b/Hacking.md
@@ -15,3 +15,16 @@
   1. cd openstack-puppet-ci
   2. bundle install (or create a rvm : rvm use ruby-1.9.3-p385;rvm gemset use puppet-dev)
   3. rake lint
+
+### Run spec test from a train (offline rake spec)
+
+The rake task « spec » is an alias to `spec_prep` + `spec_standalone` + `spec_clean`.
+
+If you don't have a internet connection, just run before (in order to populate
+fixtures):
+
+>     rake spec_prep
+
+And then in your train:
+
+>     rake spec_standalone
diff --git a/Rakefile b/Rakefile
index b6e16591..27564fb5 100644
--- a/Rakefile
+++ b/Rakefile
@@ -19,4 +19,5 @@ PuppetLint.configuration.send('disable_nested_classes_or_defines')
 PuppetLint.configuration.send('disable_selector_inside_resource')
 
 task(:default).clear
-task :default => [:spec, :lint]
+task :default => [:spec_prep, :spec_standalone, :lint]
+