diff --git a/doc/src/sgml/protocol.sgml b/doc/src/sgml/protocol.sgml
index 6731fa9..4aba99a 100644
--- a/doc/src/sgml/protocol.sgml
+++ b/doc/src/sgml/protocol.sgml
@@ -6198,6 +6198,50 @@ Relation
 
 <varlistentry>
 <term>
+Type
+</term>
+<listitem>
+<para>
+
+<variablelist>
+<varlistentry>
+<term>
+        Byte1('Y')
+</term>
+<listitem>
+<para>
+                Identifies the message as an type message.
+</para>
+</listitem>
+</varlistentry>
+<varlistentry>
+<term>
+        Int32
+</term>
+<listitem>
+<para>
+                OID of the data type.
+</para>
+</listitem>
+</varlistentry>
+<varlistentry>
+<term>
+        String
+</term>
+<listitem>
+<para>
+                Name of the data type.
+</para>
+</listitem>
+</varlistentry>
+
+</variablelist>
+</para>
+</listitem>
+</varlistentry>
+
+<varlistentry>
+<term>
 Insert
 </term>
 <listitem>
