in src/main/java/org/apache/maven/plugins/changelog/ChangeLogReport.java [1113:1121]
protected void doSummary(ChangeLogSet set, ResourceBundle bundle, Sink sink) {
sink.paragraph();
sink.text(bundle.getString("report.TotalCommits"));
sink.text(": " + set.getChangeSets().size());
sink.lineBreak();
sink.text(bundle.getString("report.changelog.FilesChanged"));
sink.text(": " + countFilesChanged(set.getChangeSets()));
sink.paragraph_();
}