diff --git a/MANIFEST.in b/MANIFEST.in
index da988f1a6b0a3d228792a2f30b2398d104d3fb10..0a5bd4a0292f333d9316f0ecc1fd5741365bf809 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1 +1,2 @@
 include src/geomtools/sfx/report.ipynb
+include src/geomtools/powder/calibrants/*.D