diff --git a/Installation.md b/Installation.md
index ccafd94..e20ee5e 100644
--- a/Installation.md
+++ b/Installation.md
@@ -34,6 +34,8 @@ Install `unrar` and `7z` and `bsdtar`
 
 ### Windows / Mac
 
+To use Kindle Previewer 4, released in Sept 2026, you must use KCC 11.3.0+.
+
 Install [Kindle Previewer 3 (KP3)](https://www.amazon.com/Kindle-Previewer/b?ie=UTF8&node=21381691011). KCC will automatically detect KindleGen from it.
 
 An older version of KindleGen can be automatically detected from [Kindle Comic Creator (KC2)](https://www.amazon.com/Kindle-Comic-Creator/b?ie=UTF8&node=23496309011) as backup in case you have issues with KP3.