diff --git a/executables/PostgreSQLBinary/PTI.hs b/executables/PostgreSQLBinary/PTI.hs
new file mode 100644
--- /dev/null
+++ b/executables/PostgreSQLBinary/PTI.hs
@@ -0,0 +1,77 @@
+module PostgreSQLBinary.PTI where
+
+import BasePrelude
+
+
+-- | A Postgresql type info
+data PTI = PTI { oidOf :: !Word32, arrayOIDOf :: !(Maybe Word32) }
+
+abstime         = PTI 702  (Just 1023)
+aclitem         = PTI 1033 (Just 1034)
+bit             = PTI 1560 (Just 1561)
+bool            = PTI 16   (Just 1000)
+box             = PTI 603  (Just 1020)
+bpchar          = PTI 1042 (Just 1014)
+bytea           = PTI 17   (Just 1001)
+char            = PTI 18   (Just 1002)
+cid             = PTI 29   (Just 1012)
+cidr            = PTI 650  (Just 651)
+circle          = PTI 718  (Just 719)
+cstring         = PTI 2275 (Just 1263)
+date            = PTI 1082 (Just 1182)
+daterange       = PTI 3912 (Just 3913)
+float4          = PTI 700  (Just 1021)
+float8          = PTI 701  (Just 1022)
+gtsvector       = PTI 3642 (Just 3644)
+inet            = PTI 869  (Just 1041)
+int2            = PTI 21   (Just 1005)
+int2vector      = PTI 22   (Just 1006)
+int4            = PTI 23   (Just 1007)
+int4range       = PTI 3904 (Just 3905)
+int8            = PTI 20   (Just 1016)
+int8range       = PTI 3926 (Just 3927)
+interval        = PTI 1186 (Just 1187)
+json            = PTI 114  (Just 199)
+line            = PTI 628  (Just 629)
+lseg            = PTI 601  (Just 1018)
+macaddr         = PTI 829  (Just 1040)
+money           = PTI 790  (Just 791)
+name            = PTI 19   (Just 1003)
+numeric         = PTI 1700 (Just 1231)
+numrange        = PTI 3906 (Just 3907)
+oid             = PTI 26   (Just 1028)
+oidvector       = PTI 30   (Just 1013)
+path            = PTI 602  (Just 1019)
+point           = PTI 600  (Just 1017)
+polygon         = PTI 604  (Just 1027)
+record          = PTI 2249 (Just 2287)
+refcursor       = PTI 1790 (Just 2201)
+regclass        = PTI 2205 (Just 2210)
+regconfig       = PTI 3734 (Just 3735)
+regdictionary   = PTI 3769 (Just 3770)
+regoper         = PTI 2203 (Just 2208)
+regoperator     = PTI 2204 (Just 2209)
+regproc         = PTI 24   (Just 1008)
+regprocedure    = PTI 2202 (Just 2207)
+regtype         = PTI 2206 (Just 2211)
+reltime         = PTI 703  (Just 1024)
+text            = PTI 25   (Just 1009)
+tid             = PTI 27   (Just 1010)
+time            = PTI 1083 (Just 1183)
+timestamp       = PTI 1114 (Just 1115)
+timestamptz     = PTI 1184 (Just 1185)
+timetz          = PTI 1266 (Just 1270)
+tinterval       = PTI 704  (Just 1025)
+tsquery         = PTI 3615 (Just 3645)
+tsrange         = PTI 3908 (Just 3909)
+tstzrange       = PTI 3910 (Just 3911)
+tsvector        = PTI 3614 (Just 3643)
+txid_snapshot   = PTI 2970 (Just 2949)
+unknown         = PTI 705  Nothing
+uuid            = PTI 2950 (Just 2951)
+varbit          = PTI 1562 (Just 1563)
+varchar         = PTI 1043 (Just 1015)
+void            = PTI 2278 Nothing
+xid             = PTI 28   (Just 1011)
+xml             = PTI 142  (Just 143)
+
diff --git a/postgresql-binary.cabal b/postgresql-binary.cabal
--- a/postgresql-binary.cabal
+++ b/postgresql-binary.cabal
@@ -1,7 +1,7 @@
 name:
   postgresql-binary
 version:
-  0.5.0
+  0.5.1
 synopsis:
   Encoders and decoders for the PostgreSQL's binary format
 description:
@@ -89,6 +89,8 @@
     executables
   main-is:          
     Tests.hs
+  other-modules:
+    PostgreSQLBinary.PTI
   ghc-options:
     -threaded
     "-with-rtsopts=-N"
@@ -102,7 +104,7 @@
     postgresql-binary,
     HTF == 0.12.*,
     quickcheck-instances == 0.3.*,
-    QuickCheck >= 2.6 && < 2.8,
+    QuickCheck >= 2.7 && < 2.8,
     -- database:
     postgresql-libpq == 0.9.*,
     -- data: