1 files changed, 1 insertions, 1 deletions

diff --git a/doc/api.md b/doc/api.md
index c6a4569..4f43d2c 100644
--- a/doc/api.md
+++ b/doc/api.md
@@ -109,7 +109,7 @@ struct message {
 
 struct tree_leaf {
     struct message;
-    u8 signature_over_message[32];
+    u8 signature_over_message[64];
     u8 key_hash[32];
 }
 ```