diff --git a/README.md b/README.md
index d044a77..8f1344b 100644
--- a/README.md
+++ b/README.md
@@ -20,10 +20,20 @@ Please install the following dependencies before installing this project:
 
 ## Install
 
+**important:**
+
+* jupyterlab 4.0+: use 4+:
+
 ```
 pip install jupyterlab-tensorboard-pro
 ```
 
+* jupyterlab 3.x: use 3:
+
+```
+pip install jupyterlab-tensorboard-pro~=3.0
+```
+
 > only jupyterlab support, not include notebook
 
 ## Background