diff --git a/config.go b/config.go
index e84babc..d73cb99 100644
--- a/config.go
+++ b/config.go
@@ -10,8 +10,12 @@ import (
 // Config provides a way to configure the Handler depending on your needs.
 type Config struct {
 	// DataStore implementation used to store and retrieve the single uploads.
-	// Must no be nil.
+	// The usage of this field is deprecated and should be avoided in favor of
+	// StoreComposer.
 	DataStore     DataStore
+	// StoreComposer points to the store composer from which the core data store
+	// and optional dependencies should be taken. May only be nil if DataStore is
+	// set.
 	StoreComposer *StoreComposer
 	// MaxSize defines how many bytes may be stored in one single upload. If its
 	// value is is 0 or smaller no limit will be enforced.