diff --git a/windows/deployment/update/wufb-reports-do.md b/windows/deployment/update/wufb-reports-do.md
index a02d0d0993..eca5fbdfa8 100644
--- a/windows/deployment/update/wufb-reports-do.md
+++ b/windows/deployment/update/wufb-reports-do.md
@@ -164,7 +164,7 @@ There are many Microsoft [content types](waas-delivery-optimization.md#types-of-
 ## Frequency Asked Questions
 
 - **What time period does the Delivery Optimization data include?**
-Data is generated/aggregated for the last 28 days for active devices.
+Data is generated/aggregated for the last 28 days for active devices. For Delivery Optimization data to register in the report, the device must have performed some Delivery Optimization action in the 28-day rolling window. This includes device configuration information. 
 
 - **Data is showing as 'Unknown', what does that mean?**
 You may see data in the report listed as 'Unknown'. This status indicates that the Delivery Optimization DownloadMode setting is either invalid or empty.