diff --git a/src/cmd_signfile.rs b/src/cmd_signfile.rs
index 780d034..c1d9167 100644
--- a/src/cmd_signfile.rs
+++ b/src/cmd_signfile.rs
@@ -130,7 +130,7 @@ pub struct CommandImpl;
 //   "specification": "https://openwebstandard.org/simple-sign-file/v1",
 //   "version": "v1",
 //   "filename": "example.zip",
-//   "digest": "HEX(SHA256(filename-content))",
+//   "digest": "sha256-HEX(SHA256(filename-content))",
 //   "timestamp": 1700964163340,
 //   "attributes": "****",
 //   "comment": "***",