diff --git a/spring/Spring Security/Spring Security.md b/spring/Spring Security/Spring Security.md
index 95bdd78..738c083 100644
--- a/spring/Spring Security/Spring Security.md	
+++ b/spring/Spring Security/Spring Security.md	
@@ -334,4 +334,6 @@ UserDetailsManager users(DataSource dataSource) {
 	return users;
 }
 ```
+### UserDetails
+UserDetails是通过UserDetailsService返回的。DaoAuthenticationProvider对UserrDetails进行验证并且返回