diff --git a/objectType.xml b/objectType.xml
index 4467a41..cbbbd63 100644
--- a/objectType.xml
+++ b/objectType.xml
@@ -24,5 +24,10 @@
 			<classname>chat\system\user\online\location\ChatLocation</classname>
 			<languagevariable>chat.user.usersOnline.location.ChatPage</languagevariable>
 		</type>
+		<type>
+			<name>be.bastelstu.chat.message</name>
+			<definitionname>com.woltlab.wcf.attachment.objectType</definitionname>
+			<classname>chat\system\attachment\MessageAttachmentObjectType</classname>
+		</type>
 	</import>
 </data>
diff --git a/userGroupOption.xml b/userGroupOption.xml
index 3ce7c2d..899069e 100644
--- a/userGroupOption.xml
+++ b/userGroupOption.xml
@@ -38,6 +38,27 @@
 				<defaultvalue>none</defaultvalue>
 				<admindefaultvalue>all</admindefaultvalue>
 			</option>
+			<option name="user.chat.maxAttachmentSize">
+				<categoryname>user.chat</categoryname>
+				<optiontype>fileSize</optiontype>
+				<defaultvalue>1000000</defaultvalue>
+				<options>module_attachment</options>
+				<minvalue>10000</minvalue>
+			</option>
+			<option name="user.chat.allowedAttachmentExtensions">
+				<categoryname>user.chat</categoryname>
+				<optiontype>textarea</optiontype>
+				<defaultvalue><![CDATA[gif
+jpg
+jpeg
+png
+bmp
+zip
+txt
+pdf]]></defaultvalue>
+				<options>module_attachment</options>
+				<wildcard><![CDATA[*]]></wildcard>
+			</option>
 			<option name="mod.chat.canAlwaysEnter">
 				<categoryname>mod.chat</categoryname>
 				<optiontype>boolean</optiontype>