diff --git a/check.xml b/check.xml
index 90655ed4f..495cf4b95 100644
--- a/check.xml
+++ b/check.xml
@@ -109,7 +109,7 @@
   <!-- Simian -->
   <property name="simian.version"
             value="2.5.10"
-            description="Which Version of Simian to use"/>
+            description="Which version of Simian to use"/>
   <property name="simian.uri"
             value="http://www.harukizaemon.com/simian/simian-${simian.version}.tar.gz"
             description="Where to get Simian"/>
@@ -128,6 +128,11 @@
             value="${build.dir}/reports/owasp-dc"
             description="Where to store the OWASP Dependency Check reports"/>
 
+  <!-- Nu HTML Validator -->
+  <property name="vnu.version"
+            value="18.11.5"
+            description="Which version of Nu HTML Validator to use"/>
+
   <target name="init-ivy">
     <property name="ivy.version"  value="2.4.0"/>
     <property name="ivy.jar.url"  value="http://repo1.maven.org/maven2/org/apache/ivy/ivy/${ivy.version}/ivy-${ivy.version}.jar"/>
@@ -312,4 +317,19 @@
     </owasp:dependency-check>
   </target>
 
+  <target name="vnu" description="--> Runs the Nu HTML Validator" depends="init-ivy">
+    <ivy:cachepath organisation="nu.validator" module="validator" revision="${vnu.version}"
+                   inline="true" conf="default" pathid="nu.classpath"/>
+    <fileset dir="." id="html.files">
+      <include name="${src.dir}/**/*.html"/>
+      <include name="${manual.dir}/**/*.html"/>
+      <exclude name="${manual.dir}/index.html"/>
+    </fileset>
+    <pathconvert pathsep=" " property="html.list" refid="html.files"/>
+    <java classname="nu.validator.client.SimpleCommandLineValidator" classpathref="nu.classpath"
+          failonerror="true" taskname="vnu">
+      <arg line="--html --format text"/>
+      <arg line="${html.list}"/>
+    </java>
+  </target>
 </project>
diff --git a/src/main/org/apache/tools/ant/property/package.html b/src/main/org/apache/tools/ant/property/package.html
index 456849994..871aa122e 100644
--- a/src/main/org/apache/tools/ant/property/package.html
+++ b/src/main/org/apache/tools/ant/property/package.html
@@ -16,6 +16,9 @@
    limitations under the License.
 -->
 <html lang="en">
+<head>
+  <title>Helper classes for Ant properties</title>
+</head>
 <body>
   Contains helper classes for Ant properties.
 </body>
diff --git a/src/main/org/apache/tools/ant/taskdefs/optional/sos/package.html b/src/main/org/apache/tools/ant/taskdefs/optional/sos/package.html
index 9f0251884..ddb3dd314 100644
--- a/src/main/org/apache/tools/ant/taskdefs/optional/sos/package.html
+++ b/src/main/org/apache/tools/ant/taskdefs/optional/sos/package.html
@@ -16,6 +16,9 @@
    limitations under the License.
 -->
 <html lang="en">
+<head>
+  <title>SourceOffSite SCM tasks</title>
+</head>
 <body>
   <p>
     Ant tasks for working with a SourceOffSite source control system.
diff --git a/src/main/org/apache/tools/ant/types/resolver/package.html b/src/main/org/apache/tools/ant/types/resolver/package.html
index ab75c0e82..39217967c 100644
--- a/src/main/org/apache/tools/ant/types/resolver/package.html
+++ b/src/main/org/apache/tools/ant/types/resolver/package.html
@@ -16,6 +16,9 @@
    limitations under the License.
 -->
 <html lang="en">
+<head>
+  <title>Integration with xml-commons resolver</title>
+</head>
 <body>
 Ant integration with xml-commons resolver.
 
