diff --git a/pyTMD.pyi b/pyTMD.pyi
new file mode 100644
index 0000000..b5b8d9e
--- /dev/null
+++ b/pyTMD.pyi
@@ -0,0 +1,6 @@
+from typing import List, Union
+
+import numpy as np
+
+# Add any type stubs needed to override the problematic ones
+coefficients: Union[List, np.ndarray]