diff --git a/xlsx/scripts/office/schemas/microsoft/wml-cex-2018.xsd b/xlsx/scripts/office/schemas/microsoft/wml-cex-2018.xsd
new file mode 100644
index 0000000..364c6a9
--- /dev/null
+++ b/xlsx/scripts/office/schemas/microsoft/wml-cex-2018.xsd
@@ -0,0 +1,20 @@
+ <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:w="http://schemas.openxmlformats.org/wordprocessingml/2006/main" xmlns:s="http://schemas.openxmlformats.org/officeDocument/2006/sharedTypes" xmlns:w16="http://schemas.microsoft.com/office/word/2018/wordml" elementFormDefault="qualified" attributeFormDefault="qualified" blockDefault="#all" xmlns="http://schemas.microsoft.com/office/word/2018/wordml/cex" targetNamespace="http://schemas.microsoft.com/office/word/2018/wordml/cex">
+   <xsd:import id="w16" namespace="http://schemas.microsoft.com/office/word/2018/wordml" schemaLocation="wml-2018.xsd"/>
+   <xsd:import id="w" namespace="http://schemas.openxmlformats.org/wordprocessingml/2006/main" schemaLocation="../ISO-IEC29500-4_2016/wml.xsd"/>
+   <xsd:import id="s" namespace="http://schemas.openxmlformats.org/officeDocument/2006/sharedTypes" schemaLocation="../ISO-IEC29500-4_2016/shared-commonSimpleTypes.xsd"/>
+   <xsd:complexType name="CT_CommentsExtensible">
+     <xsd:sequence>
+       <xsd:element name="commentExtensible" type="CT_CommentExtensible" minOccurs="0" maxOccurs="unbounded"/>
+       <xsd:element name="extLst" type="w16:CT_ExtensionList" minOccurs="0" maxOccurs="1"/>
+     </xsd:sequence>
+   </xsd:complexType>
+   <xsd:complexType name="CT_CommentExtensible">
+     <xsd:sequence>
+       <xsd:element name="extLst" type="w16:CT_ExtensionList" minOccurs="0" maxOccurs="1"/>
+     </xsd:sequence>
+     <xsd:attribute name="durableId" type="w:ST_LongHexNumber" use="required"/>
+     <xsd:attribute name="dateUtc" type="w:ST_DateTime" use="optional"/>
+     <xsd:attribute name="intelligentPlaceholder" type="s:ST_OnOff" use="optional"/>
+   </xsd:complexType>
+   <xsd:element name="commentsExtensible" type="CT_CommentsExtensible"/>
+ </xsd:schema>