diff --git a/readme.md b/readme.md
index ff0945c..24c9889 100644
--- a/readme.md
+++ b/readme.md
@@ -41,6 +41,7 @@ unsigned char seed[32];
 unsigned char signature[64];
 unsigned char public_key[32];
 unsigned char private_key[64];
+unsigned char scalar[32];
 ```
 
 API