diff --git a/MANIFEST.in b/MANIFEST.in
index 2bb6bb1..6199a06 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -9,3 +9,4 @@ recursive-exclude * __pycache__
 recursive-exclude * *.py[co]
 
 recursive-include docs *.rst conf.py Makefile make.bat
+recursive-include graphene_custom_directives *