diff --git a/mysql.go b/mysql.go
index 4d436616..5d200ccf 100644
--- a/mysql.go
+++ b/mysql.go
@@ -179,7 +179,8 @@ func (db *mysql) GetColumns(tableName string) (map[string]*Column, error) {
 				cts := strings.Split(string(content), "(")
 				var len1, len2 int
 				if len(cts) == 2 {
-					lens := strings.Split(cts[1][0:len(cts[1])-1], ",")
+					idx := strings.Index(cts[1], ")")
+					lens := strings.Split(cts[1][0:idx], ",")
 					len1, err = strconv.Atoi(strings.TrimSpace(lens[0]))
 					if err != nil {
 						return nil, err
diff --git a/xorm/README.md b/xorm/README.md
new file mode 100644
index 00000000..188a41fa
--- /dev/null
+++ b/xorm/README.md
@@ -0,0 +1,40 @@
+# xorm tools
+
+
+xorm tools is a set of  tools for database operation. 
+
+## Install
+
+`go get github.com/lunny/xorm/xorm`
+
+and you should install the depends below:
+
+* github.com/lunny/xorm
+
+* Mysql: [github.com/Go-SQL-Driver/MySQL](https://github.com/Go-SQL-Driver/MySQL)
+
+* MyMysql: [github.com/ziutek/mymysql/godrv](https://github.com/ziutek/mymysql/godrv)
+
+* SQLite: [github.com/mattn/go-sqlite3](https://github.com/mattn/go-sqlite3)
+
+* Postgres: [github.com/bylevel/pq](https://github.com/bylevel/pq)
+
+
+## Reverse
+
+After you installed the tool, you can type 
+
+`xorm help reverse`
+
+to get help
+
+example:
+
+`xorm reverse sqite3 test.db templates/goxorm`
+
+will generated go files in `./model` directory
+
+## LICENSE
+
+ BSD License
+ [http://creativecommons.org/licenses/BSD/](http://creativecommons.org/licenses/BSD/)
diff --git a/xorm/reverse.go b/xorm/reverse.go
index 8725143c..37e84e79 100644
--- a/xorm/reverse.go
+++ b/xorm/reverse.go
@@ -56,7 +56,7 @@ func runReverse(cmd *Command, args []string) {
 	args = args[num:]
 
 	if len(args) < 3 {
-		fmt.Println("no")
+		fmt.Println("params error, please see xorm help reverse")
 		return
 	}