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-rw-r--r--guix/nar.scm5
1 files changed, 3 insertions, 2 deletions
diff --git a/guix/nar.scm b/guix/nar.scm
index 5bf174554c..dfee309d04 100644
--- a/guix/nar.scm
+++ b/guix/nar.scm
@@ -369,8 +369,9 @@ while the locks are held."
port)
(define (assert-valid-signature signature hash file)
- ;; Bail out if SIGNATURE, an sexp, doesn't match HASH, a bytevector
- ;; containing the expected hash for FILE.
+ ;; Bail out if SIGNATURE, which must be a string as produced by
+ ;; 'canonical-sexp->string', doesn't match HASH, a bytevector containing
+ ;; the expected hash for FILE.
(let* ((signature (catch 'gcry-error
(lambda ()
(string->canonical-sexp signature))