diff --git a/Cargo.toml b/Cargo.toml
index 678b276..4d0ab4c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,6 +2,7 @@
 name = "diflouroborane"
 version = "0.1.0"
 authors = ["Gregor Reitzenstein <me@dequbed.space>"]
+license = "GPL-3.0"
 edition = "2018"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html