diff --git a/zk-token-sdk/Cargo.toml b/zk-token-sdk/Cargo.toml
index 03fbcb5f5..7ae72578f 100644
--- a/zk-token-sdk/Cargo.toml
+++ b/zk-token-sdk/Cargo.toml
@@ -4,6 +4,7 @@ description = "Solana Program Library ZkToken Program SDK"
 authors = ["Solana Maintainers <maintainers@solana.foundation>"]
 repository = "https://github.com/solana-labs/solana-program-library"
 version = "0.1.0"
+license = "Apache-2.0"
 edition = "2018"
 publish = false