diff --git a/mmseg/models/decode_heads/setr_mla_head.py b/mmseg/models/decode_heads/setr_mla_head.py
index 86e493d2e..c4e22bf7d 100644
--- a/mmseg/models/decode_heads/setr_mla_head.py
+++ b/mmseg/models/decode_heads/setr_mla_head.py
@@ -11,7 +11,7 @@ from .decode_head import BaseDecodeHead
 class SETRMLAHead(BaseDecodeHead):
     """Multi level feature aggretation head of SETR.
 
-    MLA head of `SETR  <https://arxiv.org/pdf/2012.15840.pdf>`.
+    MLA head of `SETR  <https://arxiv.org/pdf/2012.15840.pdf>`_.
 
     Args:
         mlahead_channels (int): Channels of conv-conv-4x of multi-level feature
diff --git a/mmseg/models/decode_heads/setr_up_head.py b/mmseg/models/decode_heads/setr_up_head.py
index d64896f76..a2595ad51 100644
--- a/mmseg/models/decode_heads/setr_up_head.py
+++ b/mmseg/models/decode_heads/setr_up_head.py
@@ -10,7 +10,7 @@ from .decode_head import BaseDecodeHead
 class SETRUPHead(BaseDecodeHead):
     """Naive upsampling head and Progressive upsampling head of SETR.
 
-    Naive or PUP head of `SETR  <https://arxiv.org/pdf/2012.15840.pdf>`.
+    Naive or PUP head of `SETR  <https://arxiv.org/pdf/2012.15840.pdf>`_.
 
     Args:
         norm_layer (dict): Config dict for input normalization.