diff --git a/document.tex b/document.tex
index 71d3fcb..53cf121 100644
--- a/document.tex
+++ b/document.tex
@@ -77,6 +77,7 @@ wangwenhao11@nudt.edu.cn).
 \input{main/background}
 \input{main/acyclic}
 \input{main/2048isAcyclic}
+\input{main/discussion}
 
 %\input{main/nonergodicity}
 %\input{main/paradox}
diff --git a/main/2048isAcyclic.tex b/main/2048isAcyclic.tex
index 85fb81a..5fe35db 100644
--- a/main/2048isAcyclic.tex
+++ b/main/2048isAcyclic.tex
@@ -93,7 +93,7 @@ the claim follows by applying Theorem \ref{judgmentTheorem}.
 
 %\input{material/2048prove}
 
-\subsection{Discussions}
+
 
 
 
diff --git a/main/discussion.tex b/main/discussion.tex
new file mode 100644
index 0000000..68952af
--- /dev/null
+++ b/main/discussion.tex
@@ -0,0 +1,29 @@
+\section{Discussions}
+
+
+\cite{boyan1996learning}
+
+
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diff --git a/references.bib b/references.bib
index f7782a2..5184cd3 100644
--- a/references.bib
+++ b/references.bib
@@ -9,6 +9,13 @@
   year={2019},
   publisher={Nature Publishing Group}
 }
+@inproceedings{boyan1996learning,
+  title={Learning evaluation functions for large acyclic domains},
+  author={Boyan, Justin A and Moore, Andrew W},
+  booktitle={Proceedings of the Thirteenth International Conference on  Machine Learning},
+  pages={63--70},
+  year={1996}
+}
 @article{boyan2002technical,
   title={Technical update: Least-squares temporal difference learning},
   author={Boyan, Justin A},