diff --git a/xlsx/scripts/office/schemas/ecma/fouth-edition/opc-digSig.xsd b/xlsx/scripts/office/schemas/ecma/fouth-edition/opc-digSig.xsd
new file mode 100644
index 0000000..d765f33
--- /dev/null
+++ b/xlsx/scripts/office/schemas/ecma/fouth-edition/opc-digSig.xsd
@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
+ xmlns="http://schemas.openxmlformats.org/package/2006/digital-signature"
+ targetNamespace="http://schemas.openxmlformats.org/package/2006/digital-signature"
+ elementFormDefault="qualified">
+ <xsd:element name="signatureInitializer" type="CT_SignatureInitializer"/>
+ <xsd:element name="signatureCertificate" type="CT_SignatureCertificate"/>
+ <xsd:element name="signatureComment" type="CT_SignatureComment"/>
+ <xsd:complexType name="CT_SignatureInitializer">
+  <xsd:sequence>
+   <xsd:any namespace="##any" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
+  </xsd:sequence>
+ </xsd:complexType>
+ <xsd:complexType name="CT_SignatureCertificate">
+  <xsd:sequence>
+   <xsd:any namespace="##any" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
+  </xsd:sequence>
+ </xsd:complexType>
+ <xsd:complexType name="CT_SignatureComment">
+  <xsd:sequence>
+   <xsd:any namespace="##any" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
+  </xsd:sequence>
+ </xsd:complexType>
+</xsd:schema>