diff --git a/README.md b/README.md
index 4412b1b..9715546 100644
--- a/README.md
+++ b/README.md
@@ -89,6 +89,9 @@ For Python files, add a `shebang` to the first line of the file to specify the i
 > [!TIP]
 > If you want your script-sync VSCode extension to automatically update, you should thick the autoinstall box in the vscode extension page.
 
+> [!WARNING]
+> If you use modules like `pickle` to (de)serialize objects script-sync might causes problems because we reload all the modules at every file save. This can interfere with `pickle` thinking that a class is instanciated multiple times.
+
 ## Requirements
 The plug-in needs to be installed on RhinoV8, Grasshopper and VSCode