diff --git a/docs/UsersManual.html b/docs/UsersManual.html
index 2c5139d..b33ed61 100644
--- a/docs/UsersManual.html
+++ b/docs/UsersManual.html
@@ -830,6 +830,14 @@
 </ul>
 </dd>
 
+<dt id="opt_faddress-sanitizer"><b>-f[no-]address-sanitizer</b>:
+Turn on <a href="AddressSanitizer.html">AddressSanitizer</a>,
+a memory error detector.
+
+<dt id="opt_fthread-sanitizer"><b>-f[no-]thread-sanitizer</b>:
+Turn on ThreadSanitizer, an <em>experimental</em> data race detector.
+Not ready for widespread use.
+
 <dt id="opt_fno-assume-sane-operator-new"><b>-fno-assume-sane-operator-new</b>:
 Don't assume that the C++'s new operator is sane.</dt>
 <dd>This option tells the compiler to do not assume that C++'s global new