diff --git a/bin/rndc/rndc.docbook b/bin/rndc/rndc.docbook
index 1a14f7af01..60580937a7 100644
--- a/bin/rndc/rndc.docbook
+++ b/bin/rndc/rndc.docbook
@@ -692,7 +692,7 @@
             defines the number of additional times to apply
             the algorithm when generating an NSEC3 hash.  The
             <option>salt</option> is a string of data expressed
-            in hexidecimal, or a hyphen (`-') if no salt is
+            in hexadecimal, or a hyphen (`-') if no salt is
             to be used.
           </para>
           <para>