diff --git a/README.md b/README.md
index 30624bc..1765788 100644
--- a/README.md
+++ b/README.md
@@ -174,5 +174,5 @@ If using this repository for your research or publication, please cite:
 
 ## Acknowledgment
 
-The core of this tool is inspired by [baselines/plot_util.py](https://github.com/openai/baselines/blob/master/baselines/common/plot_util.py)
+The core of this tool is inspired by [baselines/plot_util.py](https://github.com/openai/baselines/blob/master/baselines/common/plot_util.py) and [spinningup/plot.py](https://github.com/openai/spinningup/blob/master/spinup/utils/plot.py)
 
diff --git a/README_zh.md b/README_zh.md
index 1fd43c0..803f416 100644
--- a/README_zh.md
+++ b/README_zh.md
@@ -174,4 +174,4 @@ optional arguments:
 
 ## 致谢
 
-本项目的部分组件参考了[baselines/plot_util.py](https://github.com/openai/baselines/blob/master/baselines/common/plot_util.py)
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+本项目的部分组件参考了[baselines/plot_util.py](https://github.com/openai/baselines/blob/master/baselines/common/plot_util.py)与[spinningup/plot.py](https://github.com/openai/spinningup/blob/master/spinup/utils/plot.py)
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