Update README.md

eaceto · web-flow · commit 520dc6d098b5 · 2022-04-28T23:44:59.000+02:00
diff --git a/README.md b/README.md
@@ -58,6 +58,8 @@ dependencies: [
 
 ### Usage
 
+note: **warmUp** should always be called in the **Main Thread**.
+
 When you want to speed up the loading of a WebView, perform the following request with the required URL / URLRequest to load. 
 
 ````swift
