diff --git a/tools/model_explorer_circle/MANIFEST.in b/tools/model_explorer_circle/MANIFEST.in
index 8e29d51cb9e..c828836a9d8 100644
--- a/tools/model_explorer_circle/MANIFEST.in
+++ b/tools/model_explorer_circle/MANIFEST.in
@@ -1,3 +1,4 @@
 graft src
+graft tests
 
-global-exclude *~ *.py[cod]
+global-exclude *~ *.py[cod] HOWTO.md