diff --git a/guix/ui.scm b/guix/ui.scm
index 6a5feaa95394ea11c2cc1191ea5619b67088a776..29c0b2b9ceb21bda8352204406eff4bc1d31524a 100644
--- a/guix/ui.scm
+++ b/guix/ui.scm
@@ -1428,7 +1428,7 @@ (define (display-generation profile number)
           (format #t "~a~%" header)))))
 
 (define (display-profile-content-diff profile gen1 gen2)
-  "Display the changed packages in PROFILE GEN2 compared to generation GEN2."
+  "Display the changed packages in PROFILE GEN2 compared to generation GEN1."
 
   (define (equal-entry? first second)
     (string= (manifest-entry-item first) (manifest-entry-item second)))