diff --git a/models/git/branch.go b/models/git/branch.go
index 92ef2b4689c8..88ed858b1939 100644
--- a/models/git/branch.go
+++ b/models/git/branch.go
@@ -101,7 +101,7 @@ func (err ErrBranchesEqual) Unwrap() error {
 type Branch struct {
 	ID            int64
 	RepoID        int64  `xorm:"UNIQUE(s)"`
-	Name          string `xorm:"UNIQUE(s) NOT NULL"` // git's ref-name is case-sensitive internally, however, in database, it's case-insensitive at the moment
+	Name          string `xorm:"UNIQUE(s) NOT NULL"` // git's ref-name is case-sensitive internally, however, in some databases (mssql, mysql, by default), it's case-insensitive at the moment
 	CommitID      string
 	CommitMessage string `xorm:"TEXT"` // it only stores the message summary (the first line)
 	PusherID      int64