diff --git a/source/reference/method/db.collection.storageSize.txt b/source/reference/method/db.collection.storageSize.txt
index d9d3fecf630..62a8d8d1de0 100644
--- a/source/reference/method/db.collection.storageSize.txt
+++ b/source/reference/method/db.collection.storageSize.txt
@@ -7,7 +7,7 @@ db.collection.storageSize()
 .. method:: db.collection.storageSize()
 
    :returns: The total amount of storage allocated to this collection
-             for document storage. Provides a wrapper around the
+             for document storage, output displays sizes in bytes. Provides a wrapper around the
              :data:`~collStats.storageSize` field of the
              :dbcommand:`collStats`
              (i.e. :method:`db.collection.stats()`) output.