diff --git a/doc/configuration.md b/doc/configuration.md
index 428884e1a..9441116b0 100644
--- a/doc/configuration.md
+++ b/doc/configuration.md
@@ -20,6 +20,7 @@ storage:
 		encrypt: true
 		secure: true
 		v4auth: true
+		chunksize: 5242880
 		rootdirectory: /s3/object/name/prefix
 auth:
 	silly:
@@ -117,6 +118,7 @@ storage:
 		encrypt: true
 		secure: true
 		v4auth: true
+		chunksize: 5242880
 		rootdirectory: /s3/object/name/prefix
 ```