diff --git a/ttp.xsd b/ttp.xsd
index e3163bd..fcca409 100644
--- a/ttp.xsd
+++ b/ttp.xsd
@@ -362,6 +362,11 @@
 					<xs:documentation>The Infrastructure field characterizes specific classes or instances of infrastructure observed to have been utilized for cyber attack.</xs:documentation>
 				</xs:annotation>
 			</xs:element>
+			<xs:element name="Personas" type="ttp:PersonasType" minOccurs="0">
+				<xs:annotation>
+					<xs:documentation>The Personas field characterizes specific classes or instances of personas (identities) leveraged by a threat to masquerade as other parties.</xs:documentation>
+				</xs:annotation>
+			</xs:element>
 		</xs:sequence>
 	</xs:complexType>
 	<xs:complexType name="BehaviorType">
@@ -412,4 +417,13 @@
 			</xs:element>
 		</xs:sequence>
 	</xs:complexType>
+	<xs:complexType name="PersonasType">
+		<xs:sequence>
+			<xs:element name="Persona" type="stixCommon:IdentityType" maxOccurs="unbounded">
+				<xs:annotation>
+					<xs:documentation>The persona field characterizes a single persona (identity) leveraged by a threat to masquerade as another party.</xs:documentation>
+				</xs:annotation>
+			</xs:element>
+		</xs:sequence>
+	</xs:complexType>
 </xs:schema>