diff --git a/REFERENCE.md b/REFERENCE.md
index eb479926..c212f589 100644
--- a/REFERENCE.md
+++ b/REFERENCE.md
@@ -419,7 +419,7 @@ name of the apache2 service
 
 Data type: `Optional[Variant[String[1], Array[String[1]]]]`
 
-A list of the puppet facts to graph.  See ''https://github.com/voxpupuli/puppetboard''
+An array of the puppet facts to graph.  See ''https://github.com/voxpupuli/puppetboard''
 
 ### <a name="puppetboardapacheconf"></a>`puppetboard::apache::conf`