diff --git a/docs/refguide.xml b/docs/refguide.xml
index 683f952c8..fe9310e7c 100644
--- a/docs/refguide.xml
+++ b/docs/refguide.xml
@@ -433,7 +433,7 @@ you would expect.</para>
           the target list, Nmap continues to perform requested
           functions as if each target IP is active.  For machines on a
           local ethernet network, ARP scanning will still be performed
-          (unless <options>--send-ip</option> is specified) because
+          (unless <option>--send-ip</option> is specified) because
           Nmap needs MAC addressses to further scan target
           hosts.</para>
         </listitem>