diff --git a/examples/conversion.go b/examples/conversion.go
index c42a7df2..2fe7d1e2 100644
--- a/examples/conversion.go
+++ b/examples/conversion.go
@@ -27,6 +27,7 @@ var (
 	}
 )
 
+// FromDB implemented xorm.Conversion convent database data to self
 func (s *Status) FromDB(bytes []byte) error {
 	if r, ok := Statuses[string(bytes)]; ok {
 		*s = r
@@ -36,6 +37,7 @@ func (s *Status) FromDB(bytes []byte) error {
 	}
 }
 
+// ToDB implemented xorm.Conversion convent to database data
 func (s *Status) ToDB() ([]byte, error) {
 	return []byte(s.Name), nil
 }
diff --git a/logger.go b/logger.go
index 428ae8f2..727d030a 100644
--- a/logger.go
+++ b/logger.go
@@ -12,6 +12,7 @@ import (
 	"github.com/go-xorm/core"
 )
 
+// default log options
 const (
 	DEFAULT_LOG_PREFIX = "[xorm]"
 	DEFAULT_LOG_FLAG   = log.Ldate | log.Lmicroseconds