diff --git a/13.md b/13.md
index 53c4d1b6..99289c2a 100644
--- a/13.md
+++ b/13.md
@@ -35,7 +35,7 @@ Example mined note
   "created_at": 1651794653,
   "kind": 1,
   "tags": [
-    ["nonce", "776797", "21"]
+    ["nonce", "776797", "20"]
   ],
   "content": "It's just me mining my own business",
   "sig": "284622fc0a3f4f1303455d5175f7ba962a3300d136085b9566801bc2e0699de0c7e31e44c81fb40ad9049173742e904713c3594a1da0fc5d2382a25c11aba977"