diff --git a/doc.go b/doc.go
index 5f3490ca..2d782c5e 100644
--- a/doc.go
+++ b/doc.go
@@ -155,25 +155,10 @@ netmask for IPv4 and a /128 for IPv6.
 Custom Type Support
 
 pgx includes support for the common data types like integers, floats, strings,
-dates, and times that have direct mappings between Go and SQL. Support can be
-added for additional types like point, hstore, numeric, etc. that do not have
-direct mappings in Go by the types implementing ScannerPgx and Encoder.
-
-Custom types can support text or binary formats. Binary format can provide a
-large performance increase. The natural place for deciding the format for a
-value would be in ScannerPgx as it is responsible for decoding the returned
-data. However, that is impossible as the query has already been sent by the time
-the ScannerPgx is invoked. The solution to this is the global
-DefaultTypeFormats. If a custom type prefers binary format it should register it
-there.
-
-        pgx.DefaultTypeFormats["point"] = pgx.BinaryFormatCode
-
-Note that the type is referred to by name, not by Oid. This is because custom
-PostgreSQL types like hstore will have different Oids on different servers. When
-pgx establishes a connection it queries the pg_type table for all types. It then
-matches the names in DefaultTypeFormats with the returned Oids and stores it in
-Conn.PgTypes.
+dates, and times that have direct mappings between Go and SQL. In addition,
+pgx uses the github.com/jackc/pgx/pgtype library to support more types. See
+documention for that library for instructions on how to implement custom
+types.
 
 See example_custom_type_test.go for an example of a custom type for the
 PostgreSQL point type.
diff --git a/values.go b/values.go
index 1df63945..aec3cda7 100644
--- a/values.go
+++ b/values.go
@@ -64,52 +64,6 @@ const maxUint = ^uint(0)
 const maxInt = int(maxUint >> 1)
 const minInt = -maxInt - 1
 
-// DefaultTypeFormats maps type names to their default requested format (text
-// or binary). In theory the Scanner interface should be the one to determine
-// the format of the returned values. However, the query has already been
-// executed by the time Scan is called so it has no chance to set the format.
-// So for types that should always be returned in binary the format should be
-// set here.
-var DefaultTypeFormats map[string]int16
-
-func init() {
-	DefaultTypeFormats = map[string]int16{
-		"_aclitem":     TextFormatCode, // Pg's src/backend/utils/adt/acl.c has only in/out (text) not send/recv (bin)
-		"_bool":        BinaryFormatCode,
-		"_bytea":       BinaryFormatCode,
-		"_cidr":        BinaryFormatCode,
-		"_float4":      BinaryFormatCode,
-		"_float8":      BinaryFormatCode,
-		"_inet":        BinaryFormatCode,
-		"_int2":        BinaryFormatCode,
-		"_int4":        BinaryFormatCode,
-		"_int8":        BinaryFormatCode,
-		"_text":        BinaryFormatCode,
-		"_timestamp":   BinaryFormatCode,
-		"_timestamptz": BinaryFormatCode,
-		"_varchar":     BinaryFormatCode,
-		"aclitem":      TextFormatCode, // Pg's src/backend/utils/adt/acl.c has only in/out (text) not send/recv (bin)
-		"bool":         BinaryFormatCode,
-		"bytea":        BinaryFormatCode,
-		"char":         BinaryFormatCode,
-		"cid":          BinaryFormatCode,
-		"cidr":         BinaryFormatCode,
-		"date":         BinaryFormatCode,
-		"float4":       BinaryFormatCode,
-		"float8":       BinaryFormatCode,
-		"inet":         BinaryFormatCode,
-		"int2":         BinaryFormatCode,
-		"int4":         BinaryFormatCode,
-		"int8":         BinaryFormatCode,
-		"oid":          BinaryFormatCode,
-		"record":       BinaryFormatCode,
-		"tid":          BinaryFormatCode,
-		"timestamp":    BinaryFormatCode,
-		"timestamptz":  BinaryFormatCode,
-		"xid":          BinaryFormatCode,
-	}
-}
-
 // SerializationError occurs on failure to encode or decode a value
 type SerializationError string