diff --git a/quantecon/_lss.py b/quantecon/_lss.py
index e3c3794f4..70c76f828 100644
--- a/quantecon/_lss.py
+++ b/quantecon/_lss.py
@@ -1,11 +1,6 @@
 """
 Computes quantities associated with the Gaussian linear state space model.
 
-References
-----------
-
-https://lectures.quantecon.org/py/linear_models.html
-
 """
 
 from textwrap import dedent