diff --git a/python/paddle/tensor/linalg.py b/python/paddle/tensor/linalg.py
index 2a6ffc0ab66d3ac82c2da02db61e137139c0dec4..66d8c1fd3ecf1eaeab57168b1bb1a247fc8e6cf3 100644
--- a/python/paddle/tensor/linalg.py
+++ b/python/paddle/tensor/linalg.py
@@ -440,6 +440,7 @@ def dot(x, y, name=None):
 
     """
     op_type = 'dot'
+    # skip var type check in dygraph mode to improve efficiency
     if in_dygraph_mode():
         op = getattr(core.ops, op_type)
         return op(x, y)