diff --git a/costs-plugin/README.rst b/costs-plugin/README.rst
index e36d80569e97d98d037263bce39aaf0fade7b236..fffe761e46dc1f09f983476c39b625938ca5effa 100644
--- a/costs-plugin/README.rst
+++ b/costs-plugin/README.rst
@@ -6,7 +6,8 @@ Features
 
 This plugin adds a panel 'Costs' to the dashboard to visualize the costs of
 resource usage in a project.
-Costs are calculated from metrics obtained from Gnocchi and unit resource prices
+Costs are calculated from metrics obtained from Gnocchi and unit quantity
+prices for resources,
 from the cloud usage database.
 
 The panel displays a table summarizing the costs for resources consumed in a given period,