diff --git a/.gitignore b/.gitignore
index 93b87c5..559f89b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,6 +7,7 @@ static/.DS_Store
 static/images/.DS_Store
 .DS_Store
 .temp
+.idea
 node_modules
 package-lock.json
 yarn.lock
diff --git a/docs/gallery/lines_bars_and_markers/cohere.md b/docs/gallery/lines_bars_and_markers/cohere.md
index 260e6bc..7fa0011 100644
--- a/docs/gallery/lines_bars_and_markers/cohere.md
+++ b/docs/gallery/lines_bars_and_markers/cohere.md
@@ -2,7 +2,7 @@
 
 举例说明如何绘制两个信号的相干性。
 
-![绘制两个信号的相干性图示](https://matplotlib.org/_images/sphx_glr_categorical_variables_001.png)
+![绘制两个信号的相干性图示](https://matplotlib.org/_images/sphx_glr_cohere_thumb.png)
 
 ```python
 import numpy as np
@@ -37,4 +37,4 @@ plt.show()
 ## 下载这个示例
 
 - [下载python源码: cohere.py](https://matplotlib.org/_downloads/cohere.py)
-- [下载Jupyter notebook: cohere.ipynb](https://matplotlib.org/_downloads/cohere.ipynb)
\ No newline at end of file
+- [下载Jupyter notebook: cohere.ipynb](https://matplotlib.org/_downloads/cohere.ipynb)