diff --git a/pptx/scripts/office/schemas/microsoft/wml-cex-2018.xsd b/pptx/scripts/office/schemas/microsoft/wml-cex-2018.xsd
new file mode 100644
index 0000000..b3a4252
--- /dev/null
+++ b/pptx/scripts/office/schemas/microsoft/wml-cex-2018.xsd
@@ -0,0 +1 @@
+placeholder
\ No newline at end of file