diff --git a/doc/arm/Bv9ARM.ch06.html b/doc/arm/Bv9ARM.ch06.html
index 065e778ae9..43791335a2 100644
--- a/doc/arm/Bv9ARM.ch06.html
+++ b/doc/arm/Bv9ARM.ch06.html
@@ -2915,7 +2915,7 @@ options {
                   <span><strong class="command">named</strong></span>.  (A planned third option,
                   <code class="literal">external</code>, will disable all automatic
                   signing and allow DNSSEC data to be submitted into a zone
-                  via dyanmic update; this is not yet implemented.)
+                  via dynamic update; this is not yet implemented.)
                 </p>
 </dd>
 <dt><span class="term"><span><strong class="command">zone-statistics</strong></span></span></dt>