diff --git a/HowToWriteTests.md b/HowToWriteTests.md
index c695e26..65d8f14 100644
--- a/HowToWriteTests.md
+++ b/HowToWriteTests.md
@@ -52,6 +52,10 @@ So what do we use it for? It is a lens through which to view your code and your
 
 Code coverage displays turn out to be very handy for showing you facts about your tests and your code that you didn't know.
 
+# turning on verbose logging during unit tests
+
+source:trunk/docs/logging.rst#log-messages-during-unit-tests
+
 # further reading
 
 <http://twistedmatrix.com/documents/current/core/howto/testing.html>
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