diff --git a/MANIFEST.in b/MANIFEST.in
index d2200584..0547420e 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -5,6 +5,7 @@ include LICENSE
 include README.md
 
 recursive-include tests *
+recursive-include direct *.pyx *.pxd *.pxi *.py *.h *.ini *.npy *.txt *.in *.md
 recursive-exclude * __pycache__
 recursive-exclude * *.py[co]