diff --git a/scrapy/trunk/scrapy/tests/__init__.py b/scrapy/trunk/scrapy/tests/__init__.py
index b72b1493f..b69daf737 100644
--- a/scrapy/trunk/scrapy/tests/__init__.py
+++ b/scrapy/trunk/scrapy/tests/__init__.py
@@ -1 +1,20 @@
-""" """
\ No newline at end of file
+"""
+scrapy.tests: this package contains all Scrapy unittests
+
+To run all Scrapy unittests type: 
+
+    python -m scrapy.tests
+
+Keep in mind that some tests may be skipped if you don't have a MySQL database
+up and configured appropriately.
+"""
+
+if __name__ == '__main__':
+    import os
+    from twisted.trial import runner, reporter
+
+    os.environ['SCRAPY_SETTINGS_DISABLED'] = '1'
+    loader = runner.TestLoader()
+    runner = runner.TrialRunner(reporter.TreeReporter)
+    suite = loader.loadByNames(['scrapy'], recurse=True)
+    runner.run(suite)