diff --git a/Lib/test/test_complex.py b/Lib/test/test_complex.py
index 9faab71d830..f16fb3bf2e7 100644
--- a/Lib/test/test_complex.py
+++ b/Lib/test/test_complex.py
@@ -1,6 +1,9 @@
 from test_support import TestFailed
 from random import random
 
+# These tests ensure that complex math does the right thing; tests of
+# the complex() function/constructor are in test_b1.py.
+
 # XXX need many, many more tests here.
 
 nerrors = 0