tools: Enable ndnsec-dsk-gen

Change-Id: I079882b60924d71cad989492eb5650c36b24e413
Refs: #2246
diff --git a/docs/manpages.rst b/docs/manpages.rst
index 1a75a14..d7fb610 100644
--- a/docs/manpages.rst
+++ b/docs/manpages.rst
@@ -8,6 +8,7 @@
     ndnsec-get-default  <manpages/ndnsec-get-default>
     ndnsec-set-default  <manpages/ndnsec-set-default>
     ndnsec-key-gen      <manpages/ndnsec-key-gen>
+    ndnsec-dsk-gen      <manpages/ndnsec-dsk-gen>
     ndnsec-sign-req     <manpages/ndnsec-sign-req>
     ndnsec-cert-gen     <manpages/ndnsec-cert-gen>
     ndnsec-cert-revoke  <manpages/ndnsec-cert-revoke>