diff --git a/docs/TestingGuide.html b/docs/TestingGuide.html
index 841974da3cd..582b9daecfa 100644
--- a/docs/TestingGuide.html
+++ b/docs/TestingGuide.html
@@ -228,6 +228,15 @@ subdirectory.</b></p>
 </pre>
 </div>
 
+<p>To run the tests with Valgrind (Memcheck by default), just append
+<tt>VG=1</tt> to the commands above, e.g.:</p>
+
+<div class="doc_code">
+<pre>
+% gmake check VG=1
+</pre>
+</div>
+
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 <div class="doc_subsection"><a name="quicktestsuite">Test suite</a></div>
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