diff --git a/Cargo.toml b/Cargo.toml
index 0d4479f..70338a4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,6 +3,8 @@ name = "sdgb-utils-rs"
 version = "0.1.0"
 edition = "2024"
 
+license = "GPL-3.0"
+
 [dependencies]
 digest = "0.10.7"
 hmac-sha256 = { version = "1.1.12", features = ["digest010", "traits010"] }