diff --git a/hasql-mapping.cabal b/hasql-mapping.cabal
--- a/hasql-mapping.cabal
+++ b/hasql-mapping.cabal
@@ -1,6 +1,6 @@
 cabal-version: 3.0
 name: hasql-mapping
-version: 0.1
+version: 0.1.0.1
 synopsis: SDK for defining modular mappings to databases on top of Hasql
 description:
   SDK for defining mappings to databases using Hasql that promotes modular design.
diff --git a/src/library/Hasql/Mapping/IsScalar.hs b/src/library/Hasql/Mapping/IsScalar.hs
--- a/src/library/Hasql/Mapping/IsScalar.hs
+++ b/src/library/Hasql/Mapping/IsScalar.hs
@@ -22,89 +22,102 @@
   encoder :: Encoders.Value a
   decoder :: Decoders.Value a
 
--- Numeric types
+-- | Maps to PostgreSQL @bool@.
 instance IsScalar Bool where
   encoder = Encoders.bool
   decoder = Decoders.bool
 
+-- | Maps to PostgreSQL @int2@.
 instance IsScalar Int16 where
   encoder = Encoders.int2
   decoder = Decoders.int2
 
+-- | Maps to PostgreSQL @int4@.
 instance IsScalar Int32 where
   encoder = Encoders.int4
   decoder = Decoders.int4
 
+-- | Maps to PostgreSQL @int8@.
 instance IsScalar Int64 where
   encoder = Encoders.int8
   decoder = Decoders.int8
 
+-- | Maps to PostgreSQL @int8@.
 instance IsScalar Int where
   encoder = fromIntegral >$< Encoders.int8
   decoder = fromIntegral <$> Decoders.int8
 
+-- | Maps to PostgreSQL @float4@.
 instance IsScalar Float where
   encoder = Encoders.float4
   decoder = Decoders.float4
 
+-- | Maps to PostgreSQL @float8@.
 instance IsScalar Double where
   encoder = Encoders.float8
   decoder = Decoders.float8
 
+-- | Maps to PostgreSQL @numeric@.
 instance IsScalar Scientific where
   encoder = Encoders.numeric
   decoder = Decoders.numeric
 
--- Text types
+-- | Maps to PostgreSQL @text@.
 instance IsScalar Text where
   encoder = Encoders.text
   decoder = Decoders.text
 
--- Binary types
+-- | Maps to PostgreSQL @bytea@.
 instance IsScalar ByteString where
   encoder = Encoders.bytea
   decoder = Decoders.bytea
 
--- Date/Time types
+-- | Maps to PostgreSQL @date@.
 instance IsScalar Day where
   encoder = Encoders.date
   decoder = Decoders.date
 
+-- | Maps to PostgreSQL @timestamp@.
 instance IsScalar LocalTime where
   encoder = Encoders.timestamp
   decoder = Decoders.timestamp
 
+-- | Maps to PostgreSQL @timestamptz@.
 instance IsScalar UTCTime where
   encoder = Encoders.timestamptz
   decoder = Decoders.timestamptz
 
+-- | Maps to PostgreSQL @time@.
 instance IsScalar TimeOfDay where
   encoder = Encoders.time
   decoder = Decoders.time
 
+-- | Maps to PostgreSQL @timetz@.
 instance IsScalar (TimeOfDay, TimeZone) where
   encoder = Encoders.timetz
   decoder = Decoders.timetz
 
+-- | Maps to PostgreSQL @interval@.
 instance IsScalar DiffTime where
   encoder = Encoders.interval
   decoder = Decoders.interval
 
--- UUID
+-- | Maps to PostgreSQL @uuid@.
 instance IsScalar UUID where
   encoder = Encoders.uuid
   decoder = Decoders.uuid
 
--- Network types
+-- | Maps to PostgreSQL @inet@.
 instance IsScalar IPRange where
   encoder = Encoders.inet
   decoder = Decoders.inet
 
+-- | Maps to PostgreSQL @macaddr@.
 instance IsScalar (Word8, Word8, Word8, Word8, Word8, Word8) where
   encoder = Encoders.macaddr
   decoder = Decoders.macaddr
 
--- JSON types
+-- | Maps to PostgreSQL @jsonb@.
 instance IsScalar Aeson.Value where
   encoder = Encoders.jsonb
   decoder = Decoders.jsonb