1 files changed, 3 insertions, 1 deletions

diff --git a/obnam.md b/obnam.md
index 381802c..a6f9b4c 100644
--- a/obnam.md
+++ b/obnam.md
@@ -1901,7 +1901,9 @@ then stdout, as JSON, has all the values in file geninfo.json
         "major": 0,
         "minor": 0
     },
-    "extras": {}
+    "extras": {
+        "checksum_kind": "sha256"
+    }
 }
 ~~~