diff --git a/README b/README
index c90315e..e7f07d2 100644
--- a/README
+++ b/README
@@ -160,6 +160,9 @@ class NamcapPkgnameInDescTest(PkgbuildTest):
 
 * the preSetUp() method sets the rule to be used in the test
 
+* note the case, using preSetup() will cause the error "object has no attribute
+  'rule'"
+
 * the test_example1() method runs the rule on the given PKGBUILD and
   tests whether the results are as expected