diff --git a/fastNLP/models/base_model.py b/fastNLP/models/base_model.py
index 61edb91f..f1896cb2 100644
--- a/fastNLP/models/base_model.py
+++ b/fastNLP/models/base_model.py
@@ -22,6 +22,9 @@ class BaseModel(torch.nn.Module):
 
 
 class NaiveClassifier(BaseModel):
+    """
+    一个简单的分类器例子，可用于各种测试
+    """
     def __init__(self, in_feature_dim, out_feature_dim):
         super(NaiveClassifier, self).__init__()
         self.mlp = MLP([in_feature_dim, in_feature_dim, out_feature_dim])