Added in a comment

This explains why acceptance_static is used

rakelib/tests.rake

@@ -80,6 +80,8 @@ TEST_TASK_DIRS = []
 
     # Run acceptance tests
     desc "Run acceptance tests"
+    #gather_assets uses its own env because acceptance contains seeds to make the information unique
+    #acceptance_static is acceptance without the random seeding
     task "test_acceptance_#{system}", [:harvest_args] => [:clean_test_files, "#{system}:gather_assets:acceptance_static", "fasttest_acceptance_#{system}"]
 
     desc "Run acceptance tests without collectstatic"