diff --git a/gnu/installer/parted.scm b/gnu/installer/parted.scm
index 3439f211e2437950f16fc6fe5ecda14e485da58b..519996ff12b734d8961d451d07b76c8936685663 100644
--- a/gnu/installer/parted.scm
+++ b/gnu/installer/parted.scm
@@ -1012,7 +1012,7 @@ (define-syntax-rule (with-null-output-ports exp ...)
         (lambda () exp ...)))))
 
 (define (create-btrfs-file-system partition)
-  "Create an btrfs file-system for PARTITION file-name."
+  "Create a btrfs file-system for PARTITION file-name."
   (with-null-output-ports
    (invoke "mkfs.btrfs" "-f" partition)))