fix README typo

README.md

@@ -19,7 +19,7 @@ In PaddleFL, horizontal and vertical federated learning strategies will be imple
 
 - **Vertical Federated Learning**: Logistic Regression with PrivC, Neural Network with third-party PrivC [5]
 
-- **Horizontal Federated Learning**: Federated Averaging [2], Differential Privacy [6]
+- **Horizontal Federated Learning**: Federated Averaging [2], Differential Privacy [6], Secure Aggregation
 
 #### Training Strategy
 

README_cn.md

@@ -16,7 +16,7 @@ PaddleFL是一个基于PaddlePaddle的开源联邦学习框架。研究人员可
 
 - **纵向联邦学习**: 带privc的逻辑回归，带第三方privc的神经网络[5]
 
-- **横向联邦学习**: 联邦平均 [2]，差分隐私 [6]
+- **横向联邦学习**: 联邦平均 [2]，差分隐私 [6]，安全聚合
 
 #### 训练策略