diff --git a/documents/changelog.md b/documents/changelog.md
index 528fe1b7..33f79d7a 100644
--- a/documents/changelog.md
+++ b/documents/changelog.md
@@ -19,36 +19,41 @@
   }
   ```
 
-* **Soft delete's default querying scope will only check `deleted_at IS NULL`**
+* **Soft Delete's default querying scope will only check `deleted_at IS NULL`**
 
-  Before `db.Find(&user)` will generate querying SQL if user has `DeletedAt` field
+  Before it will check `deleted_at` less than `0001-01-02` also to exclude blank time, like:
 
   `SELECT * FROM users WHERE deleted_at IS NULL OR deleted_at <= '0001-01-02'`
 
-  Now won't include blank time check `<= '0001-01-02` anymore, will generat SQL like:
+  But it is not necessary if you are using type `*time.Time` for your model's `DeletedAt`, which has been used by `gorm.Model`, so below SQl is enough
 
   `SELECT * FROM users WHERE deleted_at IS NULL`
 
-  So your application's `DeletedAt` field should not use `time.Time` as data type, need to use pointer `*time.Time` or something like `NullTime`.
-  If you are using `gorm.Model`, then you are good, nothing need to be change, just make sure all records using blank time for `deleted_at` has been set to NULL, sample migration script:
+  So if you are using `gorm.Model`, then you are good, nothing need to be change, just make sure all records having blank time for `deleted_at` set to `NULL`, sample migrate script:
 
-  ```go
-  import (
-      "github.com/jinzhu/now"
-  )
+```go
+import (
+    "github.com/jinzhu/now"
+)
 
-  func main() {
-    var models = []interface{}{&User{}, &Image{}}
-    for _, model := range models {
-      db.Unscoped().Model(model).Where("deleted_at < ?", now.MustParse("0001-01-02")).Update("deleted_at", gorm.Expr("NULL"))
-    }
+func main() {
+  var models = []interface{}{&User{}, &Image{}}
+  for _, model := range models {
+    db.Unscoped().Model(model).Where("deleted_at < ?", now.MustParse("0001-01-02")).Update("deleted_at", gorm.Expr("NULL"))
   }
-  ```
+}
+```
 
 * **New ToDBName logic**
 
   Before when GORM convert Struct, Field's name to db name, only those common initialisms from [golint](https://github.com/golang/lint/blob/master/lint.go#L702) like `HTTP`, `URI` are special handled.
 
-  So field `HTTP`'s db name will be `http` not `h_t_t_p`, but some other initialisms like `SKU` that not in golint, it's db name will be `s_k_u`, this release fixed this, any upper case initialisms should be converted correctly.
+  So field `HTTP`'s db name will be `http` not `h_t_t_p`, but some other initialisms like `SKU` that not in golint, it's db name will be `s_k_u`, which looks ugly, this release fixed this, any upper case initialisms should be converted correctly.
 
-  If your applications using some upper case initialisms which doesn't exist in [golint](https://github.com/golang/lint/blob/master/lint.go#L702), you need to overwrite generated column name with tag, like `sql:"column:s_k_u"`, or alert your database's column name according to new logic
+  If your applications using some upper case initialisms which doesn't exist in [golint](https://github.com/golang/lint/blob/master/lint.go#L702), you need to overwrite default column name with tag, like `gorm:"column:s_k_u"`, or alert your database's column name according to new logic
+
+* Error `RecordNotFound` has been renamed to `ErrRecordNotFound`
+
+* `mssql` driver has been moved out from default drivers, import it with `import _ "github.com/jinzhu/gorm/dialects/mssql"`
+
+* `Hstore` has been moved to package `github.com/jinzhu/gorm/dialects/postgres`