diff --git a/bin/dnssec/dnssec-importkey.docbook b/bin/dnssec/dnssec-importkey.docbook
index f4c3f172b3..098b660c00 100644
--- a/bin/dnssec/dnssec-importkey.docbook
+++ b/bin/dnssec/dnssec-importkey.docbook
@@ -32,7 +32,7 @@
 
   <refnamediv>
     <refname><application>dnssec-importkey</application></refname>
-    <refpurpose>Import DNSKEY records from external systems so they can be managed.</refpurpose>
+    <refpurpose>import DNSKEY records from external systems so they can be managed</refpurpose>
   </refnamediv>
 
   <docinfo>
diff --git a/bin/dnssec/dnssec-revoke.docbook b/bin/dnssec/dnssec-revoke.docbook
index 156b509a9a..83e487b8b9 100644
--- a/bin/dnssec/dnssec-revoke.docbook
+++ b/bin/dnssec/dnssec-revoke.docbook
@@ -32,7 +32,7 @@
 
   <refnamediv>
     <refname><application>dnssec-revoke</application></refname>
-    <refpurpose>Set the REVOKED bit on a DNSSEC key</refpurpose>
+    <refpurpose>set the REVOKED bit on a DNSSEC key</refpurpose>
   </refnamediv>
 
   <docinfo>
diff --git a/bin/dnssec/dnssec-settime.docbook b/bin/dnssec/dnssec-settime.docbook
index ceb2fe02aa..4c5aebb146 100644
--- a/bin/dnssec/dnssec-settime.docbook
+++ b/bin/dnssec/dnssec-settime.docbook
@@ -32,7 +32,7 @@
 
   <refnamediv>
     <refname><application>dnssec-settime</application></refname>
-    <refpurpose>Set the key timing metadata for a DNSSEC key</refpurpose>
+    <refpurpose>set the key timing metadata for a DNSSEC key</refpurpose>
   </refnamediv>
 
   <docinfo>
diff --git a/bin/python/dnssec-checkds.docbook b/bin/python/dnssec-checkds.docbook
index dcf172f0ec..ed49e75b3f 100644
--- a/bin/python/dnssec-checkds.docbook
+++ b/bin/python/dnssec-checkds.docbook
@@ -32,7 +32,7 @@
 
   <refnamediv>
     <refname><application>dnssec-checkds</application></refname>
-    <refpurpose>A DNSSEC delegation consistency checking tool.</refpurpose>
+    <refpurpose>DNSSEC delegation consistency checking tool</refpurpose>
   </refnamediv>
 
   <docinfo>
diff --git a/bin/tools/named-rrchecker.docbook b/bin/tools/named-rrchecker.docbook
index d98c713d6b..34049777ce 100644
--- a/bin/tools/named-rrchecker.docbook
+++ b/bin/tools/named-rrchecker.docbook
@@ -30,7 +30,7 @@
   </refmeta>
   <refnamediv>
     <refname><application>named-rrchecker</application></refname>
-    <refpurpose>A syntax checker for individual DNS resource records</refpurpose>
+    <refpurpose>syntax checker for individual DNS resource records</refpurpose>
   </refnamediv>
 
   <docinfo>