diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # CHANGELOG
 
+## 1.4.1
+### Changed
+* `eoDeriveClasse` renamed to `eoDeriveClasses`
+### Added
+* Grammar added to documentation
+
 ## 1.3.1
 ### Changed
 * work with `hset-1.0.0`
diff --git a/postgresql-query.cabal b/postgresql-query.cabal
--- a/postgresql-query.cabal
+++ b/postgresql-query.cabal
@@ -1,5 +1,5 @@
 name:                postgresql-query
-version:             1.3.1
+version:             1.4.0
 
 synopsis: Sql interpolating quasiquote plus some kind of primitive ORM
           using it
diff --git a/src/Database/PostgreSQL/Query/TH.hs b/src/Database/PostgreSQL/Query/TH.hs
--- a/src/Database/PostgreSQL/Query/TH.hs
+++ b/src/Database/PostgreSQL/Query/TH.hs
@@ -133,7 +133,7 @@
 data EntityOptions = EntityOptions
     { eoTableName      :: String -> String -- ^ Type name to table name converter
     , eoColumnNames    :: String -> String -- ^ Record field to column name converter
-    , eoDeriveClassess :: [Name]           -- ^ Typeclasses to derive for Id
+    , eoDeriveClasses  :: [Name]           -- ^ Typeclasses to derive for Id
     , eoIdType         :: Name             -- ^ Base type for Id
     }
 
@@ -141,7 +141,7 @@
     def = EntityOptions
         { eoTableName = id
         , eoColumnNames = id
-        , eoDeriveClassess = [''Ord, ''Eq, ''Show]
+        , eoDeriveClasses = [''Ord, ''Eq, ''Show]
         , eoIdType = ''Integer
         }
 
@@ -156,10 +156,10 @@
     } deriving (Ord, Eq, Show)
 
 $(deriveEntity
-  def { eoIdType      = ''Id
-      , eoTableName   = toUnderscore
-      , eoColumnNames = toUnderscore . drop 1
-      , eoDeriveClassess =
+  def { eoIdType        = ''Id
+      , eoTableName     = toUnderscore
+      , eoColumnNames   = toUnderscore . drop 1
+      , eoDeriveClasses =
         [''Show, ''Read, ''Ord, ''Eq
         , ''FromField, ''ToField, ''PathPiece]
       }
@@ -195,7 +195,7 @@
         idcon = RecC (mkName idname)
                 [(mkName unidname, NotStrict, idtype)]
         iddec = NewtypeInstD [] entityIdName [ConT tname]
-                idcon (eoDeriveClassess opts)
+                idcon (eoDeriveClasses opts)
         tblName = eoTableName opts tnames
         fldNames = map (eoColumnNames opts . nameBase) $ cFieldNames tcon
     VarE ntableName  <- [e|tableName|]
@@ -217,10 +217,10 @@
     } deriving (Ord, Eq, Show)
 
 $(deriveEverything
-  def { eoIdType      = ''Id
-      , eoTableName   = toUnderscore
-      , eoColumnNames = toUnderscore . drop 1
-      , eoDeriveClassess =
+  def { eoIdType        = ''Id
+      , eoTableName     = toUnderscore
+      , eoColumnNames   = toUnderscore . drop 1
+      , eoDeriveClasses =
         [''Show, ''Read, ''Ord, ''Eq
         , ''FromField, ''ToField, ''PathPiece]
       }