diff --git a/guix/scripts/size.scm b/guix/scripts/size.scm
index 2446b84587dc5befc69518b230df3c229338e457..c42f4f7782255accbd0adb29a2ffb8fe27f55d6b 100644
--- a/guix/scripts/size.scm
+++ b/guix/scripts/size.scm
@@ -230,8 +230,8 @@ (define data
 ;;;
 
 (define (show-help)
-  (display (G_ "Usage: guix size [OPTION]... PACKAGE
-Report the size of PACKAGE and its dependencies.\n"))
+  (display (G_ "Usage: guix size [OPTION]... PACKAGE|STORE-ITEM
+Report the size of the PACKAGE or STORE-ITEM, with its dependencies.\n"))
   (display (G_ "
       --substitute-urls=URLS
                          fetch substitute from URLS if they are authorized"))