Compiler Plugin's Documentation on Compiler Args Seems Wrong

On this page:

http://maven.apache.org/plugins/maven-compiler-plugin/examples/pass-compiler-arguments.html

I'm instructed to express compilerArgs this way:

<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.3</version>
<compilerArgs>
<arg>-verbose</arg>
<arg>-Xlint:all,-options,-path</arg>
</compilerArgs>
</plugin>
</plugins>

When I do that I get an error:

Unrecognised tag: 'compilerArgs' (position: START_TAG seen ...</configuration>\n <compilerArgs>... @21:27)

But when I tuck the compilerArgs XML element under the configuration element, it works:

<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.3</version>
<configuration>
<compilerArgs>
<arg>-verbose</arg>
<arg>-Xlint:all,-options,-path</arg>
</compilerArgs>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>