yakindu/plugins/org.yakindu.sct.doc.user/plugin.xml

<?xml version="1.0" encoding="UTF-8"?>

<plugin>

    <extension point="org.eclipse.help.toc">
        <toc file="help/documentation-toc.xml" primary="true" />
    </extension>

    <extension point="org.eclipse.help.contexts">
        <contexts file="contexts.xml" plugin="org.yakindu.sct.ui.editor"/>
    </extension>

</plugin>