diff --git a/doc/src/sgml/protocol.sgml b/doc/src/sgml/protocol.sgml
index de2919d75de..c8b083c29cc 100644
--- a/doc/src/sgml/protocol.sgml
+++ b/doc/src/sgml/protocol.sgml
@@ -6186,7 +6186,7 @@ Relation
- OID of the column's data type.
+ ID of the column's data type.
@@ -6206,6 +6206,60 @@ Relation
+
+
+Type
+
+
+
+
+
+
+
+ Byte1('Y')
+
+
+
+ Identifies the message as a type message.
+
+
+
+
+
+ Int32
+
+
+
+ ID of the data type.
+
+
+
+
+
+ String
+
+
+
+ Namespace (empty string for pg_catalog).
+
+
+
+
+
+ String
+
+
+
+ Name of the data type.
+
+
+
+
+
+
+
+
+
Insert