diff --git a/README.txt b/README.txt
index 0815c7e..8ca069e 100644
--- a/README.txt
+++ b/README.txt
@@ -6,6 +6,7 @@ Requires PHP: 7.2.11
 License: MIT
 License URI: https://github.com/jdormit/pterotype/blob/master/LICENSE
 Stable tag: 1.2.0
+Tested up to: 4.9.8
 
 Pterotype expands your audience by giving your blog an ActivityPub stream, making it a part of the Fediverse.