diff --git a/README.md b/README.md
index 49451f8..b1a46f4 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,8 @@
 
 depup action updates version in a given file automatically.
 
+[![demo](https://user-images.githubusercontent.com/3797062/72677595-7ac4ec80-3ae1-11ea-8b49-163bb72f822c.png)](https://github.com/haya14busa/action-depup/pull/4)
+
 **Supported patterns example:**
 
 ```
@@ -26,6 +28,8 @@ yaml:
   REVIEWDOG_VERSION: 0.1.0
 ```
 
+demo: https://github.com/haya14busa/action-depup/pull/4
+
 ## Inputs
 
 ```yaml