diff --git a/lib/puppet/reports/prometheus.rb b/lib/puppet/reports/prometheus.rb
index bf4473e..080cf35 100644
--- a/lib/puppet/reports/prometheus.rb
+++ b/lib/puppet/reports/prometheus.rb
@@ -66,6 +66,11 @@ Puppet::Reports.register_report(:prometheus) do
         end
       end
 
+       file.write("# HELP puppet_report metric_help\n")
+       metrics.each do |metric, data|
+         file.write("# HELP puppet_report_#{metric} metric_help\n")
+       end
+
       file.write("# New metrics\n")
       new_metrics.each do |k, v|
         file.write("#{k} #{v}\n")