diff --git a/task.go b/task.go
index ba8c083..0a4d7e8 100644
--- a/task.go
+++ b/task.go
@@ -53,12 +53,14 @@ func (task Task) String() string {
 	text += task.Todo
 
 	if len(task.Contexts) > 0 {
+		sort.Strings(task.Contexts)
 		for _, context := range task.Contexts {
 			text += fmt.Sprintf(" @%s", context)
 		}
 	}
 
 	if len(task.Projects) > 0 {
+		sort.Strings(task.Projects)
 		for _, project := range task.Projects {
 			text += fmt.Sprintf(" +%s", project)
 		}
diff --git a/todotxt.go b/todotxt.go
index dee8c10..67ff339 100644
--- a/todotxt.go
+++ b/todotxt.go
@@ -188,7 +188,7 @@ func (tasklist *TaskList) LoadFromFilename(filename string) error {
 
 // WriteToFilename writes a TaskList to the specified file (most likely called "todo.txt").
 func (tasklist *TaskList) WriteToFilename(filename string) error {
-	return ioutil.WriteFile(filename, []byte(tasklist.String()), 0644)
+	return ioutil.WriteFile(filename, []byte(tasklist.String()), 0640)
 }
 
 // LoadFromFile loads and returns a TaskList from *os.File.