diff --git a/LICENSE b/LICENSE
index aef7147..95b83c5 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,3 +1,8 @@
+Modified source code from rust-qt-binding-generator is included as a submodule
+under the directory of the same name. That code is GNU GPL with exception to the
+generated code. It is only required to *build* Tycho, so this exception also
+applies to any binary version of Tycho.
+
 Some of the data contained in tests/data and benches/data is Copyright © Bungie
 Software. I do not own them, but am permitted to redistribute them. Everything
 else is public domain, as stated: