diff --git a/MANIFEST.in b/MANIFEST.in
index 7425f8e..18def3d 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,2 +1,3 @@
 include LICENSE.md
 include README.md
+include eqtools/_tricub.h
diff --git a/pyproject.toml b/pyproject.toml
index 52c86aa..e10e089 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,6 +11,7 @@ authors = [
 ]
 description = "Python tools for magnetic equilibria in tokamak plasmas"
 readme = "README.md"
+license = {file = "LICENSE.md"}
 dependencies = [
     "numpy",
     "scipy",