diff --git a/source/reference/database-statistics.txt b/source/reference/database-statistics.txt
index 9738cefcb85..16e87779838 100644
--- a/source/reference/database-statistics.txt
+++ b/source/reference/database-statistics.txt
@@ -100,7 +100,8 @@ Fields
 
    The total size of the data files that hold the database. This
    includes preallocated space and the :term:`padding factor`. The
-   scaling factor affects this value.
+   scaling factor affects this value. This only includes the data files
+   for the database and not the namespace file.
 
 .. stats:: nsSizeMB